The plugins are out of sync
What does it mean when The plugins are out of sync?
When you have installed Level up! Plus, and later on upgraded Level up!, the plugins fall out of sync. This means that Level up! Plus is now extending a version of Level up! that is was not developed against.
During development we do our best to anticipate compatibilty issues that could arise from this, however we cannot always guarantee it.
For example, there has been instances where some added features to Level up! (free) were hidden if an older version of Level up! Plus was installed. As a result users had to upgrade Level up! Plus for the additional features to become available.
To ensure the integrity and the well functioning of the plugins, we recommend that you do not upgrade a plugin without its counter part.