We've got a project file that opens fine on some computers and on others we get this error saying that it can't find some layer ID's and the actual layers are missing from the project file (about 10 layers). It's not a case of relinking things as the layers aren't there. All versions of AE CS6 are identical.
I can't believe adobe don't have an error code list with fixes. Managed to find 2 references to this issue on the internet and both were topics on CreativeCow with no replies.
After clicking OK on the missing layer ID errors there's another error: (26::0) Your project file is apparently damaged please save using a different name.