Argument 'activity' cannot be null

[rajashripawar11]

Fatal Exception: java.lang.NullPointerException
Argument 'activity' cannot be null

com.facebook.internal.Validate.notNull (Validate.java:67)

com.facebook.login.LoginManager$ActivityStartActivityDelegate. (LoginManager.java:519)

com.facebook.login.LoginManager.logInWithReadPermissions (LoginManager.java:263)

com.sromku.simple.fb.SessionManager.requestReadPermissions (SessionManager.java:131)

com.sromku.simple.fb.SessionManager.loginImpl (SessionManager.java:127)

com.sromku.simple.fb.SessionManager.login (SessionManager.java:112)

com.sromku.simple.fb.SimpleFacebook.login (SimpleFacebook.java:203)