ragdoll

I installed VideoPad today and most of the functions work but there's a problem when I try to build a project if I use the MJPEG, the MPEG4 or the DV codecs, hte video is correctly built. If I try to use other codecs installed on my pc (for example the camstudio lossless codec or the DivX codec) I get the "Failed to build project" error. Why does this happen?