When I open a file I have been getting strange errors. First it tells me I am missing many plugins that I definitely have such as motion blur, drop shadow and alpha brightness and contrast. They are in the list of effects. Secondly it says "After Effects error: The file format modeule could not parse the file" and third and most cryptic "After Effects warning: Error with file:"
I created the file in After Effects last year with the most current verison at the time. All the plugins were installed then and the same ones are installed now. AE treats them like they aren't the same plugins but they are. It has never been opened by anyone or on another machine.
Without any info on where you got the file from, in which version it was initially created and other details nobody can tell you much. Quite possible that it's simply from too old a version pre CS6 that no lon ger is supported in current versions.