Quartus II 11.0 SP1 Internal Error

Hi I am using 64 Bit Quartus 11.0 SP1 and when I try to do analysis and Synthesis I have the below shown Error (I am attaching the screen shot of the pop up error window as well),

Internal Error: Sub-system: PDB, File: /quartus/db/pdb/pdb_error.cpp, Line: 158

Installation Error: Unrecognized class 'QTL_BUNCHED_NODE<CDB_SGATE_NODE*,100' encountered in database file 'D:/XXX/db/YYY.root_partition.map_or.cdb'

Stack Trace:

0x260d: err_report_internal_error + 0x2d CCL_ERR

0xc734: pdb_internal_error + 0x54 DB_PDB

0xc2e1: PDB_SEGMENT_BASE::serialize_begin + 0x3621 DB_PDB

0x3743: PDB_SEGMENT_READER::read_db_header + 0x1a3 DB_PDB

0x2d58: PDB_SEGMENT_READER::open + 0x1b8 DB_PDB

0x182e: pdb_read_ptr + 0x2e DB_PDB

0x14eb09: sgn_qic_helper + 0x142369 synth_sgn

0x155c54: sgn_sgate_diff_is_old_lut + 0x6824 synth_sgn

0x15de20: sgn_sgate_diff_is_old_lut + 0xe9f0 synth_sgn

0x16371b: sgn_sgate_diff_is_old_lut + 0x142eb synth_sgn

0x164b4d: sgn_incrementally_update_netlist + 0x6d synth_sgn

0xaa1f1: sgn_qic_helper + 0x9da51 synth_sgn

0xaa56c: sgn_qic_helper + 0x9ddcc synth_sgn

0xc4e9: sgn_qic_full + 0x159 synth_sgn

0x117eb: qexe_get_tcl_sub_option + 0x1dbb comp_qexe

0x14997: qexe_process_cmdline_arguments + 0x537 comp_qexe

0x14aa1: qexe_standard_main + 0xa1 comp_qexe

0x1928: msg_exe_fini + 0xf8 CCL_MSG

0x18cc: msg_exe_fini + 0x9c CCL_MSG

0x57b4: MEM_UTILS_CHUNK_ALLOC::chunk_malloc + 0x194 ccl_mem

0x2f084: msg_exe_main + 0x74 CCL_MSG

0x1f56c: BaseThreadInitThunk + 0xc kernel32

0x33280: RtlUserThreadStart + 0x20 ntdll

End-trace

Quartus II 64-Bit Version 11.0 Build 208 07/03/2011 SJ Full Version

Service Pack Installed: 1

I have tried deleting the "db" and "incremental db" folders but this did not help.

Re-installed the Quartus II software but it did not solve the issue.Same design is working in a different machine without any issue.

Can anyone tell me what can be the issue.