@envergonul
I installed BigSur again. Initially solved my problem opera gx was opened, I was able to use it. Then when I restarted the computer I started getting errors again like this

Hello, I was using Opera stable before. I downloaded the GX and installed it. I deleted the Cache and Preference files. I don't think the problem is with that. As you can see in the attachment, I am getting an error. Can anyone help?