Hello, i have tested the experimental version of hevea, it works fine now with koi8. Thank you for your help. I think this bug is related with #397496 (hevea & utf8). Lanching 1.09.1 or 1.09.2 on utf8 tex file fails with exactly the same message that i reported for #404474 bug. while hevea 1.07 works fine with those both (koi8/utf8) encodings. Best regards Shamil