Quartus Assembler error(internal error)

Hello,all

I recently synthesis DDR2 controller(my own design) with ALT_DQDQS(quartus generate DQDQS PHY with DDR2_SDRAM). Quartus encounter a Internal error when assembler process. This error is shown as follows picture.

Can you help me to solve this problem ,thank you very much.

http://b29.photo.store.qq.com/http_imgload.cgi?/rurl4_b=e72e028073496c5b726f222663e2631660aa79c72b6cf822d673b5b94bd52664e4cf2df2465e1be691549455cf67104adf4b373c3bb35bae9dbf3a85ba8adc6ae067a33877c9682fcd79f3f99b39b5987623010d&a=28&b=29