erroro at 99 place&route.

Hi all.

sometimes, when I run compilation, quartus2 10.0 reaches 99% of the fitter and then an error appears, something like

--- Quote Start ---

Internal Error: Sub-system: CDB_ATOM, File: /quartus/db/cdb_atom/cdb_atom_port_lookup.cpp, Line: 291 Could not find matching re iterm

Stack Trace:

0xb4b14: CDB_ATOM_PORT_LOOKUP::get_equivalent_re_iterm + 0x84 (db_cdb_atom)

0xb7fe2: FITCC_VALIDATE_RE_NETLIST_OP::compare_atom_netlist_to_re_netlist + 0x2e2 (FITTER_FITCC)

0xb9a93: FITCC_VALIDATE_RE_NETLIST_OP::work + 0x133 (FITTER_FITCC)

0x3688e: FITCC_EXPERT::fitter_post_check + 0x9e (FITTER_FITCC)

0x38dc9: FITCC_EXPERT::invoke_fitter + 0x909 (FITTER_FITCC)

0x3756: _fcuda_execute + 0x1c6 (fitter_fcuda)

0x98d0: fmain_start + 0x710 (FITTER_FMAIN)

0x74dc: qfit_execute_fit + 0x19c (quartus_fit)

0x11af5: QFIT_FRAMEWORK::execute + 0x4b5 (quartus_fit)

0xd9f1: qexe_get_tcl_sub_option + 0x981 (comp_qexe)

0x10326: qexe_process_cmdline_arguments + 0x416 (comp_qexe)

0x10424: qexe_standard_main + 0x84 (comp_qexe)

0xb86e: qfit_main + 0x5e (quartus_fit)

0x1c91: msg_main_thread + 0x11 (CCL_MSG)

0x1a08: _thr_final_wrapper + 0x8 (ccl_thr)

0x1c05: msg_thread_wrapper + 0x85 (CCL_MSG)

0x8db6: mem_thread_wrapper + 0x34 (ccl_mem)

0x2e373: msg_exe_main + 0x63 (CCL_MSG)

0xbd0c: _main + 0x1c (quartus_fit)

0x13b4d: _memset + 0x15f (quartus_fit)

0x133c9: BaseThreadInitThunk + 0x11 (kernel32)

0x39ed1: RtlInitializeExceptionChain + 0x62 (ntdll)

0x39ea4: RtlInitializeExceptionChain + 0x35 (ntdll)

End-trace

[\quote]

How can I resolve this problem without deleting any folder (or recompile from the scratch my project)?