How to solve Error: 'There was an error running the batch test.' when trying to test a model in NLU Workbench

When you try to run a test on your model using test utterances in NLU Workench you might run into the following error message:

There was an error running the batch test.

It may be due to the sys_properties record glide.shared_service_scheduler.url not being set. Setting it to https://sncmlscheduler.service-now.com/ might resolve it.