Why do I get this MHC error: "Failed to locate clock plugin module file"?
If you encounter this message, or if the clock manager tab is blank, you may be using an incompatible MPLAB® Harmony Configurator (MHC) version to configure the Harmony framework.
Uninstall the current MHC plugin from MPLAB® X IDE and install the plugin that came with the version of Harmony you are using to fix the problem.
For more information, read the following: "What MHC plugin version is compatible with the version of Harmony I want to use?"