error in quartus

[Altera_Forum]

Dear all, 

When I was compiling my project, suddenly I got this error :  Quartus ERROR : *** Fatal Error: Access Violation at 0X003C3F7B Module: quartus_sta.exe Lock in use: 9 Stack Trace: 0x3f7b: PDB_VIRTUAL_OBJECT_INFO::finish_reading + 0x2b (DB_PDB) 0x37bb: PDB_SEGMENT_READER::finish_reading_all + 0x3b (DB_PDB) 0xd898: pdb_read_ptr + 0x58 (DB_PDB) 0x35f4: RDB_REPORT::~RDB_REPORT + 0x2c4 (db_rdb) 0x4d3a: RDB_REPORT::get_source_vector_file_name + 0x5ba (db_rdb) 0x5c8a: RDB_REPORT::get_report + 0xda (db_rdb) 0x17047c: STA_TDC_SYNCHRONIZER_CHAIN_FINDER::`default constructor closure' + 0x24fc (TSM_STA) 0xb631f: sta_test_incremental_a2t_rebuilds + 0xcbf (TSM_STA) 0x65b86: RtlAllocateHeap + 0x2e0 (ntdll) 0x65b86: RtlAllocateHeap + 0x2e0 (ntdll) 0x63db7: malloc + 0x78 (MSVCR90) 0x79686: _TclSetCmdNameObj + 0x1c6 (tcl85) 0x7949d: _Tcl_GetCommandFromObj + 0x5d (tcl85) 0x6675a: realloc + 0x35e (MSVCR90) 0xf156: _TclEvalObjEx + 0x176 (tcl85) 0x1570c: _Tcl_EvalObjCmd + 0x9c (tcl85) 0xdde3: _TclEvalObjvInternal + 0x283 (tcl85) 0x472ae: _TclExecuteByteCode + 0xd0e (tcl85) 0x83dfa: _TclObjInterpProcCore + 0x4a (tcl85) 0x83d93: _TclObjInterpProc + 0x33 (tcl85) 0xdde3: _TclEvalObjvInternal + 0x283 (tcl85) 0x472ae: _TclExecuteByteCode + 0xd0e (tcl85) 0x46113: _TclCompEvalObj + 0xc3 (tcl85) 0xf280: _TclEvalObjEx + 0x2a0 (tcl85) 0x1811f: _Tcl_IfObjCmd + 0x27f (tcl85) 0xdde3: _TclEvalObjvInternal + 0x283 (tcl85) 0x472ae: _TclExecuteByteCode + 0xd0e (tcl85) 0x83dfa: _TclObjInterpProcCore + 0x4a (tcl85) 0x83d93: _TclObjInterpProc + 0x33 (tcl85) 0xdde3: _TclEvalObjvInternal + 0x283 (tcl85) 0xe99e: _TclEvalEx + 0x6ee (tcl85) 0xe29c: _Tcl_EvalEx + 0x1c (tcl85) 0x66561: _Tcl_FSEvalFileEx + 0x1a1 (tcl85) 0x653df: _Tcl_EvalFile + 0x1f (tcl85) 0x9c5f: qexe_ipc_progress_bar_name + 0x86f (comp_qexe) End-traceDo anyone know what error it is? :confused:  Thank you!