Error : An internal error has occurred

Hello community, I believe you are doing well. I have a small problem. When I try to change the color of a text or a component in the design part of the application, I get an error like this: An internal error has occurred. Report a bug?
yet I didn’t import anything. I developed the application and everything was fine, but suddenly I have errors when I eqqaie to modify the color. So I can’t change the color anymore. please help me.

Next time please use search :mag: