Add exception

monero/backends/jsonrpc.py

@@ -408,6 +408,7 @@ class MethodNotFound(RPCError):
 
 _err2exc = {
     -2: exceptions.WrongAddress,
+    -4: exceptions.GenericTransferError,
     -5: exceptions.WrongPaymentId,
     -8: exceptions.TransactionNotFound,
     -9: exceptions.SignatureCheckFailed,

monero/exceptions.py

@@ -41,3 +41,6 @@ class SignatureCheckFailed(MoneroException):
 
 class WalletIsNotDeterministic(MoneroException):
     pass
+
+class GenericTransferError(AccountException):
+    pass