Quartus II 11.0 SP1 Internal Error

[Altera_Forum]

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.