This will be the file itself, and no amount of repairing will help.
thanks. Any suggestions on how I can figure out the problems with the file?
I think the file itself is OK, since I can view it on my phone, and others can view it too.
If it is a problem with the file, it must be interacting badly with some feature of this version of Acrobat. Not sure what else to think?
Acrobat sometimes detects an error which other apps do not. When looking into this, invariably we find it is the file at fault.
When you get the 131 message you can do Ctrl+OK. It gives a more detailed message though it is rarely useful.
it says "Error in XRef stream" - as you said, doesn't mean much to me :-)