If its not finding the script, double check that its saved as a groovy file or a class.... 
If it has errors loading the script, double-check that you named the saved file same as the class. 
  
In example: 
class CloudChaosDruids extends Script
Means you want to save it as  
  
CloudChaosDruids.groovy 
  
  
If the loading errors persist, the script might not be up-to-date with the current version of OSBot.