"General Error" when opening a .odt file

I have trouble opening an .odt file.
using libre office writer
I have a project that I’m working on in writer on my main pc (ubuntu 13.4) that i save as .odt
i moved it to my laptop (ubuntu 13.10 with libre office to continue it. when I was done I moved it back to my main pc.
when opening the file again on my main pc i get a error message

"General Error.

General input/output error."

then I try to open it on my laptop again and get this message:

"read error.

Error reading file."

I moved the file all time using a usb thumb drive, and saved the file several time on my laptop to make sure that i had saved the file correctly. there was no trouble opening the file before i tried to move it back to my main pc.
I saved the file using “save as” directly on the thumb drive if that makes any difference.

thanks for any help

Possibly the file was corrupted in one of the sessions…

If you can share the file please upload it somewhere and share the link.

If it is confidential/private then you can try to recover the contents yourself by renaming the file extension from .odt to .zip and then open the zip file and extract the text from content.xml and images from the folder Pictures.

Hope this helps…