This conflict is caused by a duplication in your project.

Reason: The library is available in two locations during compilation, so you need to remove it from one of them.

In my case, the Date and Time library was not included in JRE 1.7, so I had added it in the pom.xml. However, when I updated to JRE 18, the error occurred because the library is already included in JRE 18. To resolve the issue, I removed it from the pom.xml, and that fixed the problem.