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When attempting to open an old project or create and open a new project unity won't open. The hub will open and when you choose a project it will close and then nothing will happen. Also when a new project it will state the unity version for the new project as unknown. I have tried uninstalling, deleting all the files under the registry editor, and also removing the files from the appdata and reinstalling and it doesn't appear to fix it. Does anyone have any suggestions on how I can fix this?enter image description here

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  • \$\begingroup\$ This looks like a bug to take up with Unity's tech support. \$\endgroup\$ – DMGregory Oct 19 '18 at 20:57
  • \$\begingroup\$ you arent logged into any account \$\endgroup\$ – Evorlor Oct 20 '18 at 2:17
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This can happen when your graphics driver not working properly

Ways to fix graphics driver

One

Because of hibernating your PC long time graphics driver won't work

Shut Down and restart your PC

that can solve your problem

that happen to me a lot

Two

Update your graphics driver

outdated graphics driver also can cause problem

Another reason

If you are starting the Unity3D game Engine for the first time

then you have log in to a Unity3D account

you can create that account from Unity3D website

Happy Gaming

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Well I don't know much about it, but what I know ( **In my experience**), I'll share it.


**The Problem happened to me because yesterday I downloaded & Installed Unity Pro 2020.xfx. from a website. (Cracked one).**
I did it because of curiosity.
Today when i was working on a sample project, suddenly unity closed.
I tried to open it many times with no luck.
I searched for solution online, but no luck.

**Then I did the following-

  1. I deleted the Unity_lic file from C:\ProgramData\Unity

  2. I uninstalled the cracked Unity ( Going to Control Panel>> Uninstall a program and uninstalled the unity ( Only cracked unity will show there, simply named Unity)

  3. I installed Unity Hub again. ( Remember, I didn't uninstalled the previous Unity Hub, just overwritten it by installing again. I had the Unity hub setup file downloaded, if you don't have it, simply download from unity website)

  4. I opened Unity Hub, I got a window where it said I don't have a valid licence. I selected ACTIVATE NEW LICENCE(or something I don't remembered) Then Choosed Personal.

    And that's it.

    I changed a projects Unity Version to the Version I installed from Unity Hub( Check on Installs tab).
    And when I clicked on the project,
    It just opened. The problem solved in my case.**
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