Error running a script

I am using Photoshop Elements 2021.  I am running a plugin called Elements + (found here http://elementsplus.net) that gives Elements much of the functionality that is in regular Photoshop.  I am trying to run a jsx script file to apply effects to a photo.  Elements + has allowed me to load the script and run it.  However, when the script runs, I receive an error message.  Here is the error message:  “Error general Photoshop error occurred.  This functionality may not be available in this version of Photoshop. – The command “set” is not currently available number: -25920; line 1683”.  How do I resolve this issue?  What does the “set” command do?  I don’t know if I need to edit the script and don’t know how to do that if I do need to.  Also, it is possible that the script won’t be compatible (as it was designed for Photoshop).  I will be more than glad to provide any additional information that is needed to troubleshoot this.  Any help would be greatly appreciated.  Thanks!