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Add Mockito Dependency: Make sure that you have the Mockito dependency added to your project's build path. To add the dependency, you can use your project's build tool like Gradle or Maven.

Check the Classpath: Check if the required jar files are added to the classpath of your project. If not, add the jars to the classpath manually.

Clean Build: Try performing a clean build of your project. This will clear any cached data, rebuild the project from scratch and might resolve the issue.

Check Import Statement: Check the import statement of the mocking library. Ensure that you have the correct import statement for the version of Mockito that you're using.

Verify JDK Version: Verify if you are using the correct JDK version (Java Development Kit). Mockito requires JDK version 5 or newer. If you're using an older version, upgrade to the latest JDK version.

Restart IDE: Sometimes restarting the IDE itself can solve many issues. Try restarting your IDE and see if that fixes the problem.

Check for Conflicts: Make sure that there are no conflicts between the different versions of libraries in your project. Conflicts can occur if multiple libraries have different versions of the same class. Try resolving the conflicts and rebuild the project.