I am having this same error. I have an estimate which I made previously, and today wished to edit it and send the revised estimate to my client. I clicked Edit, and am able to make changes to the document. However, if I click "Save" (either option), "Send Update" or "Preview" I get an error at the top of the page which reads "We were not able to complete your request. Please try again." I have been trying this for about a half an hour intermittently and continuing to get the same error. I have tried closing the estimate (losing the changes I had made) and going through the process again, with the same result.
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