AVI file_open error

[-=RaDa=-]

Hi, I always used Flaskmpeg 0.546 to encode my movies, it worked without anyproblem, but now when i try to encode the movie, whenever I click on Flask It ! it gives me an "AVI_fileopen" error, I have this prob on both 0.546 and 0.6
Has anyone had this prob before?

Does anyone know a solution?