Specific Unity Project stuck importing assets

Unity Engine
1

I have been trying to open a project that I have not opened in a while. When I try to open the project, it goes into importing small assets, then tries to import the assets associated with the “com.unity” packages. When it tries to import the package assets, it hangs on any .png files. At this point, I have to force close Unity and try again. This same project opens with no issues on my partner’s computer.

At some point this project did open, but there were many errors and warnings in the console, and the package manager window option was gone. I closed the project and tried opening it again (to try and get the option back), but then it got stuck importing and I have not been able to open it since. I do not remember what I did to get the project to open in the first place.

Sometimes, the importing will go very slowly, the following image was the importer being stuck on “loading.png” for about an hour.

Any other project that I have on my computer will open without any problems. Even a project that uses the same Unity Version and similar packages installed.

More information on System, Project, etc.

  • Running Windows 10 Pro
  • Project was created in Unity Version 2018.4.15f1 but upgraded to 2018.4.16f1 somewhere along the way.
  • Unity Editor has the Android build support and Windows build support Add-ons installed.
  • Using Git for source control.
  • Computer has Visual Studio 2017 and 2019 installed.

What I have tried to resolve this issue

  • Downgraded the project to a previous Unity Version.
  • Upgraded the project to a newer Unity Version.
  • Uninstalled and reinstalled .NET Core.
  • Uninstalled and reinstalled Visual Studio 2017 and 2019.
  • Deleted Library and Temp folders from the project.
  • Recloned the project from Git.
  • Deleted the package files from AppData/Local/Unity/cache/packages
  • Opening the project from both Unity Editor Desktop and Unity Hub.
  • Removing the “com.unity.package-manager-ui” entry from “manifest.json” this only pushes the problem to another “com.unity” package, such as “com.unity.analytics”
  • Restarting my computer.

I have been searching for a similar post on Unity Forums for a while, but have not been able to find anything that has helped. Sorry if this was answered somewhere else.

If any more information is required, let me know, thanks.

2

Okay, I can get the project to open now, but I still cannot use any of the Unity Built-in packages. To get the project to open at the very least, I had to malform the “manifest.json” file and disconnect from the internet while opening the project. I believe this skipped some step in importing assets, but I am not sure. Then the project can open, but the packages that I was using throw errors in the console. At this point I try the “Reset Packages to Default” option under help, but that just recreates the error above.

I have also tried reinstalling Unity Editor 2018.4.16f1, no luck there either.