Check if you are able to connect to the team repository of your application (maybe by trying to update/commit a version which is already working or hitting the teamserver repo url like mentioned in this post: https://forum.mendix.com/link/questions/102779 ). I have migrated few apps but without any issues. General issues are provided in the documentation here, but don't see any error from what you posted. Do you get an error description?
Alternatively, check if this post helps: https://forum.mendix.com/link/questions/8822
Hope this helps.
Thanks Radhika for answer, I have tried all the mentioned steps, but it didnt resolve the issue. I created branch from main line and tried to commit it and that worked, the only issue i have is my web modeler is not connected with my app. Its not even upgrading, its not providing any logs also.