diff --git a/osc_tui/createImage.py b/osc_tui/createImage.py
index 284675b..a430e6a 100644
--- a/osc_tui/createImage.py
+++ b/osc_tui/createImage.py
@@ -1,6 +1,4 @@
-from time import sleep
 import oscscreen
-from osc_tui import createImage
 from osc_tui import main
 
 # All images combo box.
diff --git a/osc_tui/createKeyPair.py b/osc_tui/createKeyPair.py
index ada3432..bf43cc5 100644
--- a/osc_tui/createKeyPair.py
+++ b/osc_tui/createKeyPair.py
@@ -1,6 +1,5 @@
 import oscscreen
 from osc_tui import main
-from osc_tui import popup
 import os
 
 from os.path import expanduser
@@ -35,9 +34,8 @@ def back():
         self.inspector = None
 
         def write_key(path, private_key):
-            key_file = open(os.path.expanduser(path), 'w')
-            key_file.write(private_key)
-            key_file.close()
+            with open(os.path.expanduser(path), 'w') as key_file :
+                key_file.write(private_key)
 
         def create():
             if(NAME.get_value()):
diff --git a/osc_tui/createLoadbalancer.py b/osc_tui/createLoadbalancer.py
index ab24d88..06447a2 100644
--- a/osc_tui/createLoadbalancer.py
+++ b/osc_tui/createLoadbalancer.py
@@ -1,7 +1,5 @@
 import oscscreen
 from osc_tui import main
-from osc_tui import popup
-import os
 from osc_tui import preloader
 
 # NAME input.
diff --git a/osc_tui/createSnapshot.py b/osc_tui/createSnapshot.py
index 58a2792..7661098 100644
--- a/osc_tui/createSnapshot.py
+++ b/osc_tui/createSnapshot.py
@@ -45,9 +45,6 @@ def create():
                 return
             else:
                 id = ID_LIST[VOLUME_COMBO.get_value()]
-                volume = VOLUME_COMBO.get_values()[
-                    VOLUME_COMBO.get_value()
-                ]
                 res = main.GATEWAY.CreateSnapshot(
                     form=self,
                     VolumeId=id,
diff --git a/osc_tui/createVpcs.py b/osc_tui/createVpcs.py
index e42b84b..476dd9f 100644
--- a/osc_tui/createVpcs.py
+++ b/osc_tui/createVpcs.py
@@ -11,8 +11,7 @@
 # List of all Subregions
 SUBREGION = None
 
-
-class createVpcs(oscscreen.FormBaseNew):
+class CreateVpcs(oscscreen.FormBaseNew):
     def __init__(self, *args, **keywords):
         super().__init__(*args, **keywords)
 
@@ -30,14 +29,15 @@ def back():
             main.kill_threads()
             self.parentApp.switchForm("Cockpit")
 
-        self.inspector = None
-
         def create():
-            cidr = CIDR.get_value()
-            res = main.GATEWAY.CreateNet(
-                form=self,
-                IpRange=cidr,
-            )
+            cidr_value = CIDR.get_value()
+            if cidr_value:
+                main.GATEWAY.CreateNet(
+                    form=self,
+                    IpRange=cidr_value,
+                )
+            else:
+                popup.errorPopup("CIDR is missing.")
             back()
 
         global CIDR
@@ -52,7 +52,7 @@ def create():
         self.add_widget(oscscreen.ButtonPress, name="EXIT").whenPressed = back
 
 
-class createSubnet(oscscreen.FormBaseNew):
+class CreateSubnet(oscscreen.FormBaseNew):
     def __init__(self, *args, **keywords):
         super().__init__(*args, **keywords)
 
@@ -70,16 +70,18 @@ def back():
             main.kill_threads()
             self.parentApp.switchForm("Cockpit")
 
-        self.inspector = None
-
         def create():
-            cidr = CIDRSUBNET.get_value()
-            res = main.GATEWAY.CreateSubnet(
-                form=self,
-                IpRange=cidr,
-                NetId=popup.SUBNETID,
-                SubregionName=SUBREGION.get_values()[SUBREGION.get_value()],
-            )
+            cidr_value = CIDRSUBNET.get_value()
+            subregion_value = SUBREGION.get_values()[SUBREGION.get_value()]
+            if cidr_value and subregion_value:
+                main.GATEWAY.CreateSubnet(
+                    form=self,
+                    IpRange=cidr_value,
+                    NetId=popup.SUBNETID,
+                    SubregionName=subregion_value,
+                )
+            else:
+                popup.errorPopup("CIDR is missing.")
             back()
 
         global CIDR
diff --git a/osc_tui/flexibleGPU.py b/osc_tui/flexibleGPU.py
index 22167ac..761755c 100644
--- a/osc_tui/flexibleGPU.py
+++ b/osc_tui/flexibleGPU.py
@@ -1,11 +1,5 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
-from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 class Grid(selectableGrid.SelectableGrid):
     def __init__(self, screen,  *args, **keywords):
diff --git a/osc_tui/guiRules.py b/osc_tui/guiRules.py
index 036dbc7..6139128 100644
--- a/osc_tui/guiRules.py
+++ b/osc_tui/guiRules.py
@@ -12,21 +12,21 @@ def objectify():
     ret = None
     if os.path.isfile(PATH):
         ret = {}
-        configFile = open(PATH)
-        j = json.loads(configFile.read())
-        for rule_name in j:
-            rule=j[rule_name]
-            if "mode" not in rule:
-                print('"mode" is a requirre argument of costum rule',
-                      file=sys.stderr)
-            if rule["mode"] not in ret:
-                ret[rule["mode"]] = {}
-            ret[rule["mode"]][rule_name] = {
-                "ports": rule["ports"],
-                "protocols": rule["protocols"]
-            }
-            if "ips" in rule:
-                ret[rule["mode"]][rule_name]["ips"] = rule["ips"]
+        with open(PATH) as configFile :
+            j = json.loads(configFile.read())
+            for rule_name in j:
+                rule=j[rule_name]
+                if "mode" not in rule:
+                    print('"mode" is a requirre argument of costum rule',
+                          file=sys.stderr)
+                if rule["mode"] not in ret:
+                    ret[rule["mode"]] = {}
+                ret[rule["mode"]][rule_name] = {
+                    "ports": rule["ports"],
+                    "protocols": rule["protocols"]
+                }
+                if "ips" in rule:
+                    ret[rule["mode"]][rule_name]["ips"] = rule["ips"]
     return ret
 
 def parse():
diff --git a/osc_tui/imageGrid.py b/osc_tui/imageGrid.py
index 192018b..af36788 100644
--- a/osc_tui/imageGrid.py
+++ b/osc_tui/imageGrid.py
@@ -1,12 +1,6 @@
-import oscscreen
-import pyperclip
-import time
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class ImageGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/instancesGrid.py b/osc_tui/instancesGrid.py
index ef626a1..48d650f 100644
--- a/osc_tui/instancesGrid.py
+++ b/osc_tui/instancesGrid.py
@@ -1,9 +1,3 @@
-import time
-
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
diff --git a/osc_tui/keyPairsGrid.py b/osc_tui/keyPairsGrid.py
index 0617740..5ba1009 100644
--- a/osc_tui/keyPairsGrid.py
+++ b/osc_tui/keyPairsGrid.py
@@ -1,11 +1,6 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class KeyPairsGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/loadbalancerGrid.py b/osc_tui/loadbalancerGrid.py
index 18f869e..7f21b06 100644
--- a/osc_tui/loadbalancerGrid.py
+++ b/osc_tui/loadbalancerGrid.py
@@ -1,11 +1,6 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class loadbalancerGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/main.py b/osc_tui/main.py
index 85314e8..c1e6c24 100644
--- a/osc_tui/main.py
+++ b/osc_tui/main.py
@@ -14,8 +14,6 @@
 from osc_tui import profileSelector
 from osc_tui import guiRules
 
-import time
-
 # GLOBALS ATTRIBUTES
 APP = None
 GATEWAY = None
diff --git a/osc_tui/mainForm.py b/osc_tui/mainForm.py
index 7cf3ad4..d91127b 100644
--- a/osc_tui/mainForm.py
+++ b/osc_tui/mainForm.py
@@ -2,7 +2,6 @@
 import ipaddress
 
 import oscscreen
-import pyperclip
 
 import graphviz
 
@@ -27,10 +26,8 @@
 from osc_tui import popup
 from osc_tui import securityGroupsGrid
 from osc_tui import securityRulesGrid
-from osc_tui import selectableGrid
 from osc_tui import snapshotGrid
 from osc_tui import loadbalancerGrid
-from osc_tui import virtualMachine
 from osc_tui import volumesGrid
 from osc_tui import guiRules
 
@@ -44,19 +41,19 @@
 LINE_SEPARATOR_COL = MENU_WIDTH + 1
 GRID_START_COL = MENU_WIDTH +3
 
-def swicthToVolumeEdit(form, id, volume):
-    form.parentApp.addForm("Volume-Edit",
+def swicthToVolumeEdit(self, id, volume):
+    self.parentApp.addForm("Volume-Edit",
                            volumesGrid.VolumeEdit,
                            volume=volume,
                            name="osc-tui Volume-Edit {}".format(id))
-    form.parentApp.switchForm("Volume-Edit")
+    self.parentApp.switchForm("Volume-Edit")
 
-def swicthToVolumeLink(form, id, volume):
-    form.parentApp.addForm("Volume-Link",
+def swicthToVolumeLink(self, id, volume):
+    self.parentApp.addForm("Volume-Link",
                            volumesGrid.VolumeLink,
                            volume=volume,
                            name="osc-tui Volume-Link {}".format(id))
-    form.parentApp.switchForm("Volume-Link")
+    self.parentApp.switchForm("Volume-Link")
 
 
 class mainMenu(oscscreen.MultiLineAction):
@@ -199,7 +196,7 @@ def actionHighlighted(self, act_on_this, key_press):
                     if act_on_this == 'Create new':
                         self.form.parentApp.addForm(
                             "CREATE_SUBNET",
-                            createVpcs.createSubnet,
+                            createVpcs.CreateSubnet,
                             name="osc-tui")
                         self.form.parentApp.switchForm("CREATE_SUBNET")
                         return
@@ -348,12 +345,12 @@ def reload(self):
         self.parentApp.addForm("Cockpit", MainForm, name="osc-tui")
         self.parentApp.switchForm("Cockpit")
 
-    def quit_key(form, key_val):
+    def quit_key(self, key_val):
         main.kill_threads()
-        form.parentApp.switchForm("MAIN")
+        self.parentApp.switchForm("MAIN")
         
-    def key_reload(form, _):
-        form.reload()
+    def key_reload(self, _):
+        self.reload()
 
     def set_up_handlers(self):
         super().set_up_handlers()
diff --git a/osc_tui/netAccesssPoint.py b/osc_tui/netAccesssPoint.py
index 7821bdd..71b3edb 100644
--- a/osc_tui/netAccesssPoint.py
+++ b/osc_tui/netAccesssPoint.py
@@ -1,6 +1,3 @@
-import oscscreen
-import pyperclip
-
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
diff --git a/osc_tui/netPeering.py b/osc_tui/netPeering.py
index cde0f02..63dff7f 100644
--- a/osc_tui/netPeering.py
+++ b/osc_tui/netPeering.py
@@ -1,11 +1,5 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
-from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 class Grid(selectableGrid.SelectableGrid):
     def __init__(self, screen,  *args, **keywords):
diff --git a/osc_tui/popup.py b/osc_tui/popup.py
index 578717c..f16c3ca 100644
--- a/osc_tui/popup.py
+++ b/osc_tui/popup.py
@@ -368,7 +368,6 @@ def remove_cb():
 
 
 def addSecurityGroupToVm(form, form_color='STANDOUT'):
-    main.SECURITY_GROUP
     F = ConfirmCancelPopup(name='Add New Security Group', color=form_color)
     F.preserve_selected_widget = True
     groups = main.VM["SecurityGroups"]
@@ -674,7 +673,6 @@ def instances_registered():
     )
 
     def delete_cb():
-        val = main.GATEWAY.DeleteLoadBalancer(LoadBalancerName=name)
         form.current_grid.h_refresh(None)
         exit()
 
@@ -778,7 +776,6 @@ def associateRoutetable():
         exit()
 
     def delete_cb():
-        val = main.GATEWAY.DeleteSubnet(SubnetId=name)
         form.current_grid.h_refresh(None)
         exit()
     delete.whenPressed = delete_cb
diff --git a/osc_tui/profileSelector.py b/osc_tui/profileSelector.py
index 45a3489..d4803b7 100644
--- a/osc_tui/profileSelector.py
+++ b/osc_tui/profileSelector.py
@@ -3,7 +3,6 @@
 import json
 import os
 from pathlib import Path
-import threading
 from osc_tui import preloader
 
 import oscscreen
diff --git a/osc_tui/securityGroupsGrid.py b/osc_tui/securityGroupsGrid.py
index a7e1f12..584f641 100644
--- a/osc_tui/securityGroupsGrid.py
+++ b/osc_tui/securityGroupsGrid.py
@@ -1,12 +1,9 @@
-
 import oscscreen
 import pyperclip
 
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class SecurityGroupsGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/securityRulesGrid.py b/osc_tui/securityRulesGrid.py
index 2a61980..d96032a 100644
--- a/osc_tui/securityRulesGrid.py
+++ b/osc_tui/securityRulesGrid.py
@@ -1,11 +1,6 @@
-
-from osc_tui import createVm
 from osc_tui import main
-import oscscreen
 from osc_tui import popup
-import pyperclip
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class SecurityRulesGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/selectableGrid.py b/osc_tui/selectableGrid.py
index 76cced9..b93c016 100644
--- a/osc_tui/selectableGrid.py
+++ b/osc_tui/selectableGrid.py
@@ -1,11 +1,9 @@
 import curses
-import threading
 import time
 
 import oscscreen
 
 from osc_tui import main
-from osc_tui import popup
 from osc_tui import mainForm
 
 # Initially it was designed to have a thread that auto refresh... However, even if it worked fine, if too many people does it, it looks like a DDOS attack.
diff --git a/osc_tui/snapshotGrid.py b/osc_tui/snapshotGrid.py
index c5bd541..3b5c217 100644
--- a/osc_tui/snapshotGrid.py
+++ b/osc_tui/snapshotGrid.py
@@ -1,11 +1,6 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class SnapshotGrid(selectableGrid.SelectableGrid):
diff --git a/osc_tui/volumesGrid.py b/osc_tui/volumesGrid.py
index 60073c3..ca31e9b 100644
--- a/osc_tui/volumesGrid.py
+++ b/osc_tui/volumesGrid.py
@@ -1,12 +1,8 @@
-
 import oscscreen
-import pyperclip
 
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 class VolumeGrid(selectableGrid.SelectableGrid):
     def __init__(self, screen, *args, **keywords):
@@ -180,7 +176,6 @@ def on_selection(line):
         self.on_selection = on_selection
 
     def refresh_call(self, name_filter=None):
-        id = main.VM["VmId"]
         groups = main.GATEWAY.ReadVolumes(
             form=self.form, Filters={
                 'LinkVolumeVmIds': [id]})
@@ -190,7 +185,6 @@ def refresh_call(self, name_filter=None):
 
 
     def refresh(self):
-        id = main.VM["VmId"]
         groups = main.do_search(self.data.copy(), ['VolumeId', 'VolumeType',
                                                    'Size', 'SubregionName'])
         values = list()
diff --git a/osc_tui/vpcsGrid.py b/osc_tui/vpcsGrid.py
index df271df..a61c8be 100644
--- a/osc_tui/vpcsGrid.py
+++ b/osc_tui/vpcsGrid.py
@@ -1,11 +1,6 @@
-import oscscreen
-import pyperclip
-
-from osc_tui import createVm
 from osc_tui import main
 from osc_tui import popup
 from osc_tui import selectableGrid
-from osc_tui import virtualMachine
 
 
 class vpcsGrid(selectableGrid.SelectableGrid):
diff --git a/setup.py b/setup.py
index 6c3074a..680101d 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,5 @@
 # -*- coding:utf-8 -*-
 from setuptools import find_packages, setup
-import os
 
 setup(
     name='osc-tui',