Internal Error: Sub-system: ASMIO

Good day everybody,

i have this problem when the i try to generate the programming files (Assembler phase). exactly in 51% of the process

Internal Error: Sub-system: ASMIO, File: /quartus/comp/asmio/asmio_dqs.cpp, Line: 2257 re_oterm->has_fanout_exactly(1)

Stack Trace:

0x409a4: ASMIO_MIO_DQS_LOCAL_DQS_BUS_SELECT::process_atom + 0x474 (comp_asmio)

0x175ed8: process_cdb + 0x658 (comp_asm)

0x176b3c: assemble_chip + 0x33c (comp_asm)

0x17925e: assemble_dev_device + 0x12de (comp_asm)

0x17b840: asm_assemble + 0x380 (comp_asm)

0x3ddb: QASM_FRAMEWORK::execute + 0x6b (quartus_asm)

0xf211: QEXE_ARGS::get_command_line + 0x1461 (comp_qexe)

0x116b7: qexe_process_cmdline_arguments + 0x387 (comp_qexe)

0x117a4: qexe_standard_main + 0x84 (comp_qexe)

0x3ab0: qasm_main + 0x50 (quartus_asm)

0x1b81: msg_main_thread + 0x11 (CCL_MSG)

0x1be8: _thr_final_wrapper + 0x8 (ccl_thr)

0x1af5: msg_thread_wrapper + 0x85 (CCL_MSG)

0x458a: mem_thread_wrapper + 0x4a (ccl_mem)

0x28a03: msg_exe_main + 0x63 (CCL_MSG)

0x3d0c: _main + 0x1c (quartus_asm)

0x4523: __CxxThrowException@8 + 0x15f (quartus_asm)

0x13676: BaseThreadInitThunk + 0x11 (kernel32)

0x39f01: RtlInitializeExceptionChain + 0x62 (ntdll)

0x39ed4: RtlInitializeExceptionChain + 0x35 (ntdll)

End-trace

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

Service Pack Installed: 1

hope you can help thanks!!!