Cannot read id of undefined

[Lynges]

Installed the extension. Used it to activate a couple of themes. Worked fine until I tried the greenscreen dark theme. Then I got "Cannot read id of undefined" error and now I cannot activate any theme.

Tried reinstalling the extension, but it did not help. Now I just get the error when the extension loads.

Tried deleting the folder for it in .vscode/extensions but that did not help either.
I wish I could tell you more, but that is all the information I am getting from vscode.

[Lynges]

It might not be the greenscreen theme that is broken since now the error show up no matter what I do.