Error on Quartus 12

Hi, all. The project was created by Quartus 10, and it has been compiled successfully. But when I try to compile it on Quartus 12, it has an error as follow.

Anyone can help me to explain the problem and give some suggestions to solve it? Thank you very much!

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Internal Error: Sub-system: QTL, File: /quartus/h/qtl_bool_vector_sys.h, Line: 333

index >= 0 && (QTL_BOOL_VECTOR::size_type)index < this->m_size

Stack Trace:

0x262d: err_report_internal_error + 0x2d (CCL_ERR)

0x18840: QTL_BOOL_VECTOR::operator[] + 0xe7c0 (ccl_qtl)

0x15326: OPT_RAM_AI::OPT_RAM_AI + 0x11e76 (SYNTH_INFER)

0xbfa8: OPT_RAM_AI::OPT_RAM_AI + 0x8af8 (SYNTH_INFER)

0xa4a9: OPT_RAM_AI::OPT_RAM_AI + 0x6ff9 (SYNTH_INFER)

0x9735: OPT_RAM_AI::OPT_RAM_AI + 0x6285 (SYNTH_INFER)

0x14411b: opt_sea_of_mux + 0xd9b0b (SYNTH_OPT)

0x14739b: opt_sea_of_mux + 0xdcd8b (SYNTH_OPT)

0x142d74: opt_sea_of_mux + 0xd8764 (SYNTH_OPT)

0x3bdd: RTL_ROOT::RTL_ROOT + 0x2bdd (SYNTH_OPT)

0x4723: RTL_ROOT::process_sgate_netlist + 0x533 (SYNTH_OPT)

0x152808: sgn_clear_check_ip_functor + 0xbf5a8 (synth_sgn)

0x153ed2: sgn_clear_check_ip_functor + 0xc0c72 (synth_sgn)

0xae192: sgn_clear_check_ip_functor + 0x1af32 (synth_sgn)

0xb0d54: sgn_clear_check_ip_functor + 0x1daf4 (synth_sgn)

0xb1750: sgn_clear_check_ip_functor + 0x1e4f0 (synth_sgn)

0x10c2b: sgn_qic_full + 0x23b (synth_sgn)

0x1297b: qexe_get_tcl_sub_option + 0x1f2b (comp_qexe)

0x15bad: qexe_process_cmdline_arguments + 0x5ad (comp_qexe)

0x15cc1: qexe_standard_main + 0xa1 (comp_qexe)

0x17b8: MSG_INITIALIZER::~MSG_INITIALIZER + 0x118 (CCL_MSG)

0x175c: MSG_INITIALIZER::~MSG_INITIALIZER + 0xbc (CCL_MSG)

0x3c04: MEM_SEGMENT_INTERNAL::free_interthread_delete_queue + 0x94 (ccl_mem)

0x2d20f: msg_exe_main + 0x8f (CCL_MSG)

0x196ab: BaseProcessStart + 0x2b (kernel32)

End-trace

Quartus II 64-Bit Version 12.0 Build 178 05/31/2012 SJ Full Version

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