Hi @anusha161984 and sorry for the trouble with this project.
I’ve just replied to your email but I’m posting it here too in case that’s easier for you:
Are you using a recent version of Mockups 3 for Desktop?
We added a backup system (in version 3.2.1) for all projects locally to an internal folder. Can you please check in your local store folder for these backups?
The folder is called LocalProject, as detailed here.
If you can’t locate a working version of your file, could you please send us your BMPR file so that we can try to fix it here? We will keep your data strictly confidential and only long enough to try to debug your issue.
Sorry again for the trouble. Please let us know if you’re using a different version, we’ll do our best to help!