Intellij can't resolve symbol and variable might not have been initialized

Hi support team,

I got this issue "Intellij can't resolve symbol and variable might not have been initialized" for 2 days, in these days,I’ve tried invalidate caches, restart intellij, remove everything related to intellij and maven, upgrade intellij and JDK, restart my laptop, re-import project, re-install maven dependencied. But it still doesn’t work.

and the maven version and jdk version are correctly configured.

can anyone help me on it?

Thank you very much