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Justin RuckJustin Ruck 

Opportunity Task Throwing Error in Lightning Experience

I have a user that owns an Opportunity record, and when he goes to create a New Task on the Opportunity record, he gets the below error.  I tried to reproduce both under my login and logging in as him, but I cannot reproduce the error.  Any idea why this might be happening?

User-added image
Best Answer chosen by Justin Ruck
Andy BoettcherAndy Boettcher
I would urge you to log a case with Salesforce support to assist you with this error - if it only happens on his computer (try having him log on as him on your computer and see if the error happens) - that IE browser looks OLD though - LEX is only officially supported on IE11.