Symptoms

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Virtual agent designer fails to load with the following error in the console.

GET https://instance.service-now.com/scripts/convo-builder/thirdparty/intl/locales/NUL.jsx?v=07-14-2018_1223&lang=NUL 404 (Not Found) 
12:36:11.950 $conversation-builder.do:18 GET https://instance.service-now.com/scripts/convo-builder/thirdparty/intl/locales/NUL.jsx?v=07-14-2018_1223&lang=NUL 404 (Not Found) 

Release

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London

Cause

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User's profile language is set to NUL which doesn't exist.

Resolution

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1) Open user record for the user in question
2) Change the language from NUL to a specific language.