The property GroupsManaged does not seem to exist. Did you mean groupsManaged?
An attempt at access to an undefined property has been detected. This may either be a typographical error
or the property has been renamed but there are still references to its old name.
If you really want to allow access to undefined properties, you can define magic methods
to allow access. See the php core documentation on Overloading.
This check marks private properties in classes that are never used. Those properties can be removed.