Can't open Unity project anymore

I can’t open the Unity editor in my project anymore because of a non existent error.
My pc crashes sometimes because it’s a MEDION ERAZER pc.
The pc is not good because it often crashes and freezes. Before this error appeared it froze and then I needed to restart my pc.
The error logs are:

  • Unknown error occurred while loading ‘Library/Artifacts/18/18cc3f05170d68f3793b6ca494eef20’.
  • Assets\TrainCarInfo.cs(590,33): error CS0246: The type or namepsace name ‘CargoLivableScript’ could not be found (are you missing a using directive or an assembly reference?)

The code where the error is (line 590) is:

return true;
                }
            }
        }
        return false;
    }
    public void AddCargoLivable(CargoLivableScript cls) // Error Line 590
    {

        //Debug.Log("addCargoLivable");

        foreach (var item in cargoTypeValues)

I also attached a file to this thread (NVIDIA_Share_yfm16wx1K5.png)
I really worked hard on this game I made.
Can somebody please help? Any help would be appreciated.

Smells like perhaps a Reimport All would solve the first issue, which is likely what is causing the second issue, ASSUMING that it used to work properly originally. Right-click in project window, Reimport All.

I’m sorry you’ve had this issue. Please consider using proper industrial-grade enterprise-qualified source control in order to guard and protect your hard-earned work.

Personally I use git (completely outside of Unity) because it is free and there are tons of tutorials out there to help you set it up as well as free places to host your repo (BitBucket, Github, Gitlab, etc.).

You can also push git repositories to other drives: thumb drives, USB drives, network drives, etc., effectively putting a complete copy of the repository there.

As far as configuring Unity to play nice with git, keep this in mind:

https://discussions.unity.com/t/736093/3

Here’s how I use git in one of my games, Jetpack Kurt:

https://discussions.unity.com/t/807568/3

Using fine-grained source control as you work to refine your engineering:

https://discussions.unity.com/t/826718/2

Share/Sharing source code between projects:

https://discussions.unity.com/t/719810/2

Setting up an appropriate .gitignore file for Unity3D:

https://discussions.unity.com/t/834885/5

Generally setting Unity up (includes above .gitignore concepts):

https://thoughtbot.com/blog/how-to-git-with-unity

It is only simple economics that you must expend as much effort into backing it up as you feel the work is worth in the first place.

“Use source control or you will be really sad sooner or later.” - StarManta on the Unity3D forum boards