Sorry for the delay. The bug message apeared only when i tried to open these two files (please ignore the weird names >u<) but all the times that i tried to open the bug mesage to screenshot it Synfig chashed before it apeared, and somethimes randonly opened the archive like nothing happend. I really don´t know exacly why, but i never recieved the bug message before when opened other files, and those are smaller than the old animation archives that i made...