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.