Pls HELP and URGENT! "Video rendering error: -50"....

I used the newest version of FCPX 10.1.2 and Compressor 4.1.2 program to edit and export a 2hrs and 22 mins 1080HD video production in project.

After I finished the editing and want to export the whole video by using "send to compressor" function or "share" button in FCPX, the progress of exporting will be failed in the middle and show the message "Video rendering error: -50".

I can't see any problem in my project and have tried to re-export the video in different formats several times on different computers, but the result is the same "Video rendering error: -50".......... Anyone can tell me how can i solve the problem? Please.