Illustrator Scripting :: CS6 PlacedItems Relink Method - Sometimes Producing Error

I am creating a script on illustrator CS6 that will loop through all the images and relink these images to there current location, it is used to update all of the links in the file. However sometimes when i run this script i will get the error 376('x ') i have searched for the meaning of this and cannot find it anywhere. It is being written in extendscript, the code i am using is shown below:
 
// execute the main function
main();
// Construct the main function
function main() {
        var retVal = "OK";
[code]....