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WEBENCH-POWER-DESIGNER: Unable to create/use custom part

Part Number: WEBENCH-POWER-DESIGNER
Other Parts Discussed in Thread: LM3481

I am attempting to use a custom part in a design for a SEPIC converter using the LM3481.

After entering the custom part specs, WEBENCH seems to attempt to reload the design which then hangs infinitely. Examining the browser console reveals a few errors: 

Any ideas on how to resolve this issue? I would like to use a part that is not already known by WEBENCH but have been unable to do so.