Help! Cannot edit schematic in Cadence

 Tried opening some of my previous schematics in cadence and found that I could not edit them.
All the edit functions'/buttons such as "add wire", "add instance", "delete", etc.. are gone from the menus. If I press the bindkeys to try initiate, say, a delete, an error msg shows on icfb:

*WARNING* schExistsEditCap: ERROR (LM -30): License server ("") does not support feature "Virtuoso_Multi_mode_Simulation"

Any help is appreciated.
Fabian