Document generation, API, how to Deepak error

Hi

I've tested the API for the document generation and when I was using one document which it's not so much formatting it was working fine and now when I'm trying a document with more complex formats it is failing. It's giving me this error response:

{ "error": { "code": "CORRUPT_DOCUMENT", "message": "The input file appears to be corrupted and cannot be processed.; requestId=8PHWyk3LUZOefMx41VZeTej3aaS3hdfv", "status": 400 }, "status": "failed" }

When I try to merge document with the adobe addin in the msword app, it is working fine. How can I debug or get more details about what exactly is causing the problem?