This issue is linked to the fact that sometimes the geodatabase is locked when opening the network or using the geodabase in data-manager and the lock does not expire.

When this is happening, it is necessary:

1> to close Cube and all the applications with the geodatabase opened (to unlocked it) - re-open and try again

2> if 1 is not solving the issue, it may be necessary to re-create just the output dataset in the same geodatabase (gdb or mdb)

3> if 1 and 2 are not solving, it may be necessary to re-create the geodatabase gdb or mdb (but this is not generally necessary)