Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
It is ideal, when typing a very long hard-to-do-over piece of text or explanation/explication, to save the work often.
As for that error message... was it received from JustAnswer.com, or from use of some other site?
And, were you working on a Windows PC, or an Apple computer?
And, with which browser program were you working at the time?
If it was JustAnswer's site that threw out that error, then if you like a bug report can be made, once I know that much about the situation, please. Thanks.