Quartus II Error

did you find the solution ??? i have exactly the same problem... thanks ...

Internal Error: Sub-system: SUTIL, File: /quartus/synth/sutil/sutil_device.cpp, Line: 1242

is_legal_device()

Stack Trace:

0x286cc: CDB_SGATE_NETLIST::dfs_visit_oterm + 0x55c (db_cdb_sgate)

0x9702: MEM_SEGMENT_INTERNAL::locked_allocate + 0x62 (ccl_mem)

End-trace

Quartus II Version 9.1 Build 350 03/24/2010 SJ Web Edition

Service Pack Installed: 2