Hello
Since some month ago i can’t start Anki again. Today i tryed it again: I deinstalled Anki installed the newest Version “anki-2.1.46-windows.exe” but the error havn’t gone. I tried all the hints given here: When problems occur - Frequently Asked Questions (ankiweb.net)
To start by pressing the shift Key doesn’t help.
the errors are the following:
thank you for your help
Lothar
Maybe you are not holding shift long enough? I do not think you would get that error if add-ons had been disabled.
Ah ok, thank you very much. It worked, when i pressed shift much much longer. 
And now: how can I fix the problem? All the add-ons are updated now. But how can I find out wich of them makes the error? When I start Anki without shift it makes the error again.
(I have to say that on a desk top PC Anki work perfectli but on the Notebook it doesn’t. Both with Windows 10.)
Thank you.
It’s probably caused by the FEN Chess Visualizer 2.1 add-on (no longer being updated). Try disabling it. If that doesn’t fix the issue, you have to disable your add-ons one by one until you find the one causing it.
Thank you. It was the ‘JS Loader For PGN Chess IS Booster’.
I’m wondering why Anki works on the other Computer with it. Ok problem solved hope that I didn’t use it for my flash cards.
Thank you very much!