Hello guys!

After we develop a mobile application, we migrate it from development environment to test environment. But what we can't quite understand that is in the test environment,  when we try to generate this application to make it to be used in the mobile,  the problem as shown in the figure happened.

It's that happened because we did something wrong? Or we didn't do something must be done? And what kind of situation can cause such a problem?

Looking forward to your reply.

Best regards, Thanks.