Unity project breaks when pushed to and then cloned from GitHub

I have a Unity Project MainProject which I edited and then pushed to a branch in GitHub. I then merged this branch into my main branch. My friend wanted to edit and open the project so he cloned it but it did not open. I tried it too by cloning the main branch into a new directory on my computer. When I opened the newly cloned project ClonedProject, it would not open. Instead, Unity threw these errors:

ERROR: Assets/Scripts/scr_PlayerMovement.cs(4,7): error CS0246: The type or namespace name 'TMPro' could not be found (are you missing a using directive or an assembly reference?)

ERROR: Assets/Scripts/scr_PlayerMovement.cs(5,19): error CS0234: The type or namespace name 'UI' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

I use VS Code for editing and my Unity version is 2023.2.20f1

I expected Unity to open my project like MainProject but it did not.

I searched the internet but none of the solutions had anything related to my specific problem. The weird thing is that Unity does generate a Library folder which should contain these things (I think).

Here is my .gitignore file because I am thinking that some files that Unity needs are not being pushed to the GitHub repository.: ProjektKursInfo/.gitignore at main · Sneezy123/ProjektKursInfo · GitHub (that’s the project repo)

UPDATE:

What the answer metioned worked. The project can now be loaded. Still the the scripts are not applied to the objects and they have all there values to 0 / None. Which folder is missing in my repo.

That is fixed now too. I had to remove the *.meta which was in my .gitignore because of Visual Studio.

Understanding the Errors:

The errors you’re seeing indicate that Unity is unable to find the necessary references for the TMPro and UnityEngine.UI namespaces. This typically occurs when required packages or assemblies are missing.

Troubleshooting Steps:

  1. Verify Package Presence:
  • TMPro: Ensure that the TextMesh Pro package is installed in your Unity project. If not, download and import it from the Asset Store.
  • UI: Check if the UI module is enabled in your Unity project settings. Go to Edit > Project Settings > Player and make sure the “UI” module is ticked.
  1. Review gitignore File:
  • The .gitignore file you provided seems correct, but double-check that it’s not excluding any essential files or folders that Unity needs to load the project. Ensure that files like Library , obj , and Temp are not excluded.
  1. Check for Missing References in Scripts:
  • Inspect your scripts (like scr_PlayerMovement.cs ) for any missing or incorrect references. Ensure that you have the correct using directives at the top of your scripts to reference the necessary namespaces.
  1. Re-Import Assets:
  • If you’ve made recent changes to your project, try re-importing all assets to ensure that Unity correctly recognizes and processes them. Go to Assets > Reimport All .
  1. Create a New Project and Copy Assets:
  • As a last resort, create a new Unity project, copy the relevant assets from your GitHub repository into the new project, and then try opening it. This can help isolate any potential issues with the existing project’s structure.

Additional Tips:

  • Version Control: Make sure you’re using a compatible version of Unity with the project you’re working on. Check the project’s version requirements.
  • Collaborator Communication: If you’re collaborating with others, ensure that everyone is using the same Unity version and has the necessary packages installed.
  • Clean Build: Try cleaning the project’s build folder (usually located in Assets/obj ) and rebuilding the project. This can sometimes resolve unexpected issues.

By following these steps and carefully reviewing your project setup, you should be able to successfully open and work on your Unity project. If you continue to encounter problems, please provide more details about your project structure, Unity version, and any additional steps you’ve taken.