What OS? Have you installed the latest AE update? Do you have the latest version of Quicktime installed?
OS 7 i also have quicktime player using AE10.1
> OS 7
I don't understand this answer.
For the record, there's also no such thing as AE 10.1.
Unless you provide detailed, accurate information, it's impossible to help you. A decent answer to my earlier post might have been:
Windows 7 Home Edition - 64 bit
Quicktime Player 7.1.1
After Effects 10.0.1.19
Intel Quad Core 2.6, 8GB RAM, Nvidia 6400 256MB graphics
Windows 7 64 bit 10.0.1 AE
sorry for the lack of detail
If you have customized output modules setup and those modules don't have the corresponding output plugins, you will get this error. For example, in CS4 you could output Animated GIF, whereas in CS5 this is no longer available (as far as I am aware). If you have a template loaded that uses Animated GIF, for example, you will get the error message.
Go into your output module templates and delete the offending module.
That error shouldn't stop you from using the actual program.
Are you using the retail version or the trial version ?