LoggerFactory is not a Logback LoggerContext but Logback is on the classpath.

This error message indicates that the LoggerFactory is not able to instantiate a Logback LoggerContext, even though Logback is present on the classpath. This could be due to a misconfiguration of the LoggerFactory or Logback, or due to a version mismatch between the two.

To resolve this issue, you can try the following steps:

1. Check the configuration of the LoggerFactory and ensure that it is pointing to the correct Logback configuration file.
2. Verify that the Logback version is compatible with the LoggerFactory version.
3. Ensure that all necessary Logback dependencies are included in the classpath.
4. Try restarting the application or refreshing the classpath to ensure that the changes take effect.

If these steps do not resolve the issue, you may need to consult the documentation for the LoggerFactory and Logback or seek assistance from the community or support team.