OK so i don't know what is happening right now it stoped working again every time i press squirt gif it just render the comp to avi video and then the dos window appears for split second and close. I dont know what im doing wrong because the other day it was working fine now i only get avi file.
I've seen this happen when your harddrive is near full. It can also happen if your project is in the root of a drive and not in a folder. Another thing to check is that you have the AE option "Allow scripts to write files and access the network" set.