Sometimes, a project is source controlled with a bad artifact mistakenly included that causes a regression from a previous checked in project version. You can import an older project version with "-mode overwrite" to rollback on your server instance.
To fix this in source control, you should use a known good copy to transfer the ‘good’ artifacts into your latest project zip. After re-importing, re-saving, and re-testing, you can check in the new fixed project.