AA15 initCode must create sender

The initCode does not return any sender address.

Possible reasons:

1. The initCode factory is not creating an account.
2. The initCode factory is creating an account, but is not returning the deployed sender address.

Possible solutions

1. Check that the initCode is correct.
   1. The first 20 bytes should be the factory address.
   2. The remaining bytes should be the encoded function call.
2. Verify that the initCode factory is implemented correctly, i.e., it deploys the smart account and returns the sender address.