Manager access required - when viewing reports

We installed the server in version 4.8.
The database is on a SQL Server Express (version 12.0.6329.1). We use ldap integration to a Microsoft domain.
We have set up several groups to which the trackers (FMB001) are assigned.
The problem is, if you want to display the report trips or route of a certain group as a normal user (without admin rights) the following error occurs::
Manager access required - SecurityException (PermissionsManager: 178 <*: 308 <Trips: 60 <ReportResource: 170 <...)
As an admin user, the error does not occur.
The error only occurs with a certain group, it works without problems with all other groups.
What can that be?

I found the error myself, a tracker in the group was deactivated ...