Error in Assembler

Hi All,

I encounter assembler error in Quartus 9.0 SP2.

The error message is as following:

How to fix it?

Thank you. :)

Internal Error: Sub-system: ASM, File: /quartus/comp/asm/asm_lab.cpp, Line: 2560

num_matches == 1

Stack Trace:

0x230F66 : asm_assemble + 0x4DD6 (comp_asm)

0x23064C : asm_assemble + 0x44BC (comp_asm)

0x22F516 : asm_assemble + 0x3386 (comp_asm)

0x22C631 : asm_assemble + 0x4A1 (comp_asm)

0xCCFF : qexe_get_command_line + 0x26F (comp_qexe)

0x38E3 : QCU_ACF_SETTING::operator= + 0x11E3 (comp_qcu)

0x7C29 : QCU_FRAMEWORK::check_license + 0x139 (comp_qcu)

0xFBBD : qexe_process_cmdline_arguments + 0x34D (comp_qexe)

End-trace

Quartus II Version 9.0 Build 235 06/17/2009 SJ Full Version

Service Pack Installed: 2