Doubt in Apple Script code during file/folder copy process

Hi,

   I have created apple script application for the process to copy files/folder from given source path to destination path. Once files/folders are copied, doing relink process in InDesign files. Src and Destination paths are given in XL.

Apple Script Code for this process is working fine.  Then I converted the Code to Apple Script Application and Run the Application by clicking but Its throwing the below error.  I don't know why the application throwing this error, when the code is working fine.

Is there is any other way to protect Apple Script code??

Can anyone help me....

Thanks,

Sudha K