Live in Quebec, work for Fed. Gov in Ontario. I don't have an amount on my Relevé1 box E (Quebec Income tax withheld), Turbo is gave an error that it should be filled.

If the message is a warning, and you didn’t get a RL-1 slip, then you can ignore the message. Box E on the RL-1 is Quebec Tax withheld at source, which if you worked in Ontario, you would not have paid.