Add Track: a serious problem has occurred

When I try to add a MIDI / Audio / Instrument track, the following error occurs:
"a serious problem has occurred…"Cubase 64bit 2021.3.30 (594.7 KB)err

please help to solve this problem

Hi and welcome on the forum,

Please, update to the latest Cubase 10.5.30.

Hello Martin.
Thank you for your help.

Updated to the latest Cubase 10.5.30, but it did not help.
The error still appears.


Could you please attach the latest Cubase 10.5.30 *.dmp file?

attached. Look here please.
Cubase 64bit 2021.3.31 (808.3 KB)


Could you try in Cubase Safe Start Mode [Disable preferences], please?

After update to version 11, the error does not appear.
Thank you for your help.