diff --git a/bdk-ffi/src/bdk.udl b/bdk-ffi/src/bdk.udl
index 28013ae7..895ebb8b 100644
--- a/bdk-ffi/src/bdk.udl
+++ b/bdk-ffi/src/bdk.udl
@@ -4,11 +4,6 @@ namespace bdk {};
 // bdk crate - error module
 // ------------------------------------------------------------------------
 
-[Error]
-enum Alpha3Error {
-  "Generic"
-};
-
 [Error]
 interface Bip39Error {
   BadWordCount(u64 word_count);
@@ -348,7 +343,7 @@ interface BumpFeeTxBuilder {
 
   BumpFeeTxBuilder enable_rbf_with_sequence(u32 nsequence);
 
-  [Throws=Alpha3Error]
+  [Throws=CreateTxError]
   Psbt finish([ByRef] Wallet wallet);
 };
 
diff --git a/bdk-ffi/src/error.rs b/bdk-ffi/src/error.rs
index 7f0e1254..b58deb70 100644
--- a/bdk-ffi/src/error.rs
+++ b/bdk-ffi/src/error.rs
@@ -7,7 +7,7 @@ use bdk::descriptor::DescriptorError as BdkDescriptorError;
 use bdk::wallet::error::BuildFeeBumpError;
 use bdk::wallet::signer::SignerError as BdkSignerError;
 use bdk::wallet::tx_builder::{AddUtxoError, AllowShrinkingError};
-use bdk::wallet::{NewError, NewOrLoadError};
+use bdk::wallet::NewOrLoadError;
 use bdk_esplora::esplora_client::{Error as BdkEsploraError, Error};
 use bdk_file_store::FileError as BdkFileError;
 use bdk_file_store::IterError;
@@ -23,12 +23,6 @@ use bdk::bitcoin::bip32;
 use bdk::wallet::error::CreateTxError as BdkCreateTxError;
 use std::convert::TryInto;
 
-#[derive(Debug, thiserror::Error)]
-pub enum Alpha3Error {
-    #[error("generic error in ffi")]
-    Generic,
-}
-
 #[derive(Debug, thiserror::Error)]
 pub enum Bip32Error {
     #[error("Cannot derive from a hardened key")]
@@ -510,6 +504,38 @@ impl From<AddUtxoError> for CreateTxError {
     }
 }
 
+impl From<AllowShrinkingError> for CreateTxError {
+    fn from(error: AllowShrinkingError) -> Self {
+        match error {
+            AllowShrinkingError::MissingScriptPubKey(_script) => {
+                CreateTxError::ChangePolicyDescriptor
+            }
+        }
+    }
+}
+
+impl From<BuildFeeBumpError> for CreateTxError {
+    fn from(error: BuildFeeBumpError) -> Self {
+        match error {
+            BuildFeeBumpError::UnknownUtxo(outpoint) => CreateTxError::UnknownUtxo {
+                outpoint: outpoint.to_string(),
+            },
+            BuildFeeBumpError::TransactionNotFound(txid) => CreateTxError::UnknownUtxo {
+                outpoint: txid.to_string(),
+            },
+            BuildFeeBumpError::TransactionConfirmed(txid) => CreateTxError::UnknownUtxo {
+                outpoint: txid.to_string(),
+            },
+            BuildFeeBumpError::IrreplaceableTransaction(txid) => CreateTxError::UnknownUtxo {
+                outpoint: txid.to_string(),
+            },
+            BuildFeeBumpError::FeeRateUnavailable => CreateTxError::FeeRateTooLow {
+                required: "unavailable".to_string(),
+            },
+        }
+    }
+}
+
 impl From<BdkDescriptorError> for DescriptorError {
     fn from(error: BdkDescriptorError) -> Self {
         match error {
@@ -644,30 +670,6 @@ impl From<std::io::Error> for PersistenceError {
     }
 }
 
-impl From<AllowShrinkingError> for Alpha3Error {
-    fn from(_: AllowShrinkingError) -> Self {
-        Alpha3Error::Generic
-    }
-}
-
-impl From<BuildFeeBumpError> for Alpha3Error {
-    fn from(_: BuildFeeBumpError) -> Self {
-        Alpha3Error::Generic
-    }
-}
-
-impl From<AddUtxoError> for Alpha3Error {
-    fn from(_: AddUtxoError) -> Self {
-        Alpha3Error::Generic
-    }
-}
-
-impl From<bdk::bitcoin::bip32::Error> for Alpha3Error {
-    fn from(_: bdk::bitcoin::bip32::Error) -> Self {
-        Alpha3Error::Generic
-    }
-}
-
 impl From<BdkBip32Error> for Bip32Error {
     fn from(error: BdkBip32Error) -> Self {
         match error {
@@ -696,12 +698,6 @@ impl From<BdkBip32Error> for Bip32Error {
     }
 }
 
-impl From<NewError<std::io::Error>> for Alpha3Error {
-    fn from(_: NewError<std::io::Error>) -> Self {
-        Alpha3Error::Generic
-    }
-}
-
 impl From<BdkCalculateFeeError> for CalculateFeeError {
     fn from(error: BdkCalculateFeeError) -> Self {
         match error {
diff --git a/bdk-ffi/src/lib.rs b/bdk-ffi/src/lib.rs
index 9c014532..7e27a783 100644
--- a/bdk-ffi/src/lib.rs
+++ b/bdk-ffi/src/lib.rs
@@ -15,7 +15,6 @@ use crate::bitcoin::Transaction;
 use crate::bitcoin::TxOut;
 use crate::descriptor::Descriptor;
 use crate::error::AddressError;
-use crate::error::Alpha3Error;
 use crate::error::Bip32Error;
 use crate::error::Bip39Error;
 use crate::error::CalculateFeeError;
diff --git a/bdk-ffi/src/wallet.rs b/bdk-ffi/src/wallet.rs
index d81f1a37..6a578a7d 100644
--- a/bdk-ffi/src/wallet.rs
+++ b/bdk-ffi/src/wallet.rs
@@ -1,8 +1,8 @@
 use crate::bitcoin::{FeeRate, OutPoint, Psbt, Script, Transaction};
 use crate::descriptor::Descriptor;
 use crate::error::{
-    Alpha3Error, CalculateFeeError, CannotConnectError, CreateTxError, PersistenceError,
-    SignerError, TxidParseError, WalletCreationError,
+    CalculateFeeError, CannotConnectError, CreateTxError, PersistenceError, SignerError,
+    TxidParseError, WalletCreationError,
 };
 use crate::types::{AddressIndex, AddressInfo, Balance, CanonicalTx, LocalOutput, ScriptAmount};
 
@@ -582,13 +582,17 @@ impl BumpFeeTxBuilder {
         })
     }
 
-    pub(crate) fn finish(&self, wallet: &Wallet) -> Result<Arc<Psbt>, Alpha3Error> {
-        let txid = Txid::from_str(self.txid.as_str()).map_err(|_| Alpha3Error::Generic)?;
+    pub(crate) fn finish(&self, wallet: &Wallet) -> Result<Arc<Psbt>, CreateTxError> {
+        let txid = Txid::from_str(self.txid.as_str()).map_err(|_| CreateTxError::UnknownUtxo {
+            outpoint: self.txid.clone(),
+        })?;
         let mut wallet = wallet.get_wallet();
-        let mut tx_builder = wallet.build_fee_bump(txid)?;
+        let mut tx_builder = wallet.build_fee_bump(txid).map_err(CreateTxError::from)?;
         tx_builder.fee_rate(self.fee_rate.0);
         if let Some(allow_shrinking) = &self.allow_shrinking {
-            tx_builder.allow_shrinking(allow_shrinking.0.clone())?;
+            tx_builder
+                .allow_shrinking(allow_shrinking.0.clone())
+                .map_err(CreateTxError::from)?;
         }
         if let Some(rbf) = &self.rbf {
             match *rbf {
@@ -600,7 +604,7 @@ impl BumpFeeTxBuilder {
                 }
             }
         }
-        let psbt: BdkPsbt = tx_builder.finish().map_err(|_| Alpha3Error::Generic)?;
+        let psbt: BdkPsbt = tx_builder.finish()?;
 
         Ok(Arc::new(psbt.into()))
     }