Groovy Script for Grouping Data

Summary: I am creating an OM Extension where I am calculating the total weight of items on the Sales Order grouped by Warehouse. I have created a sample code to achieve this using Arrays but getting an error.

Content (please ensure you mask any confidential information):

Attached Sample code which initializes an array of lists with 5 items. Trying to calculate total grouped by Class in attached sample code.

Getting the following error: loader groovy.lang.GroovyClassLoader attempted duplicate class definition for ExID300000135821574__127

Version (include the version you are using, if applicable):

24C

Code Snippet (add any code snippets that support your topic, if applicable):