Sometimes, we get into problems while transforming data between two or more formats. There could be few reasons which might cause the issue. Here is the list of issues : 

• If you see FileNotFound or if you see there is no .ac file in your installation directory, that means there might be some issues while downloading scripts from our script server. 
• Ensure you have published all your connections. 
• Ensure https://appseconnectstore.blob.windows.net/ is accessible on your network and is not firewalled.
• Ensure there is permission to write it to the directory.

If you cannot solve the issue, please contact support@appseconnect.com for further discussion.