hi all, I have completely reinstalled the miktex. and changed the miktex.ini file as follows as suggested by Taco Hoekwater in the eariler mail. trie_op_size=35111 trie_size=250000 now it works alright. I have to only see whether metafun works ok. in the eariler version all metafun examples of metafun manual failed. thanks Hans, willy, xiang for your help. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com