Cubase AI 15 become unstable

When launching Cubase AI 15, a window labeled “Safe Mode” appears, displaying the following message:
“An error occurred while executing the following file, and the application has terminated:
C:\Program Files\Common Files\VST3\Steinberg\Groove Agent SE.vst3\Contents\x86_64-win\Groove Agent SE.vst3
If this error persists, please send the log file below to technical support:
(Option 1) Send log file to Steinberg
(Option 2) View log file in Explorer (Note: clicking this option produces no response)”
Furthermore, after the aforementioned window appears, the following window pops up whenever I perform the action described below, regardless of which startup option is selected. Action: While working on a project, drag and drop the following from the right-hand menu: VST Instruments → Drum → Groove Agent SE → Beat Agent GA 4 SE → Ambience Kit 01 (the same issue occurs with other kits loaded in Groove Agent SE or kits other than Beat Agent).
What happens:
An error message like this appears:
"A serious problem has occurred in the following file: (A filename should appear here, but it is blank)
Cubase 15.0.30 64bit has become unstable. Try to save your project under a new name to keep any unsaved changes, and restart Cubase 15.0.30 64bit.

if the problem persists, proceed as follows:
Check the file information above to determine which component caused the problem.
Contact Steinberg Technical Support or, if the problem was caused by a third-party plug-in, the manufacturer of the plug-in.
please provide a description of the action that led to the problem. Please also include the following file: (The message cuts off here; no log file path or name was listed.)"
The issue first occurred after I selected “Minimal Kit 01” in the Groove Agent SE 6 interface, then selected “Minimal Kit 01” again and clicked “Save” to overwrite it.
At that time, the following error message also appeared:
“No usable single note or MIDI file was specified for Prelisten Clip Option. A default MIDI file is used to create the prelisten file instead.”

note: i used google translate beccause i am japanese