Could not publish application to client

Could not publish application to client

Hello Everyone

We have some problem with publishing our app to another client. We want to create test app to communicate with out system and after that publish it in Zoho marketplace. But first of all we want just test it. When I click "Publish" in Publish to Client I get " Could not publish application to client". What does it mean?

We will be very pleased to get some help.

Thanks in advance