1. Restart idea
2. Clear the cache and download again:
3. Reload the project in the pom file under the project that reported the error
4. Rebuild the project
The above four methods still cannot be solved, and the most violent solution can be used if no other reason can be found.
5. Click File->Settings->Build, Execution, Deployment->Compoler and fill in the following positions:
-Djps.track.ap.dependencies=false
