Internal Error: Sub-system: ASMIO, File: /quartus/comp/asmio/asmio_dqs.cpp, Line: 447

Hi All

I'm using ArriaII GX.

in my proj , it contains 4 ddr3 controller(altmemphy)

Compile the proj, with QuartusII 10.1/11, when assembler ,it returns an error

Internal Error: Sub-system: ASMIO, File: /quartus/comp/asmio/asmio_dqs.cpp, Line: 4477 temp_result == result

Stack Trace:

0x3441f: ASMIO_MIO_DQS_DELAY_CHAIN_INPUT_SELECT::process_atom + 0x2bf (comp_asmio)

0x14cd98: process_cdb + 0x5a8 (comp_asm)

0x14d942: assemble_chip + 0x302 (comp_asm)

0x14ffde: assemble_dev_device + 0x12de (comp_asm)

0x1525c0: asm_assemble + 0x380 (comp_asm)

0x3d9a: QASM_FRAMEWORK::execute + 0x6a (quartus_asm)

0xd9e1: qexe_get_tcl_sub_option + 0x981 (comp_qexe)

0x10287: qexe_process_cmdline_arguments + 0x387 (comp_qexe)

0x10374: qexe_standard_main + 0x84 (comp_qexe)

0x3a70: qasm_main + 0x50 (quartus_asm)

0x1cb1: msg_main_thread + 0x11 (CCL_MSG)

0x1bc8: _thr_final_wrapper + 0x8 (ccl_thr)

0x1c25: msg_thread_wrapper + 0x85 (CCL_MSG)

0x6720: mem_thread_wrapper + 0x32 (ccl_mem)

0x2c4a3: msg_exe_main + 0x63 (CCL_MSG)

0x3ccc: _main + 0x1c (quartus_asm)

0x43f1: __CxxThrowException@8 + 0x15f (quartus_asm)

0x17076: RegisterWaitForInputIdle + 0x48 (kernel32)

End-trace

Quartus II Version 10.1 Build 197 01/19/2011 SJ Full Version

Service Pack Installed: 1

How can I fix the error ??

Can anyone help me?