Back in the early days of my career and supporting end users, I used to constantly get people say:

   “xxx doesn’t work. I just get an error”

They would never tell me what the error message actually was. And when I asked, the reply often was

   “I don’t remember. I’ve closed it now”. 

It used to wind me up rotten. I can forget non-technical people not understanding the error message. But common sense should have kicked in that the error message is important to share with the person trying to fix said error.