Just in case someone else encounters this issue. We have Macs and PCs in our office. We were getting the following two errors on PCs after packaging up a recent project:
After Effects error: There was an error processing this PDF document. (1074397201) ( 50 :: 29 )
After Effects error: cannot reopen an open file. ( 3 :: 130 )
Followed by AE crashing.
Macs opened the packaged project with no errors.
SOLUTION: Prior to packaging, move all assets into folders with PC acceptable names (no \ / : * ? " < > | allowed). We usually do this but missed a folder with a "/" which was translated into an unreadable character (for PC) in the directory structure of the packaged project.
FEATURE REQUEST: A more meaningful error code(s) would have been helpful in tracking down this issue.