Hello, smpelectricx2.

Thanks for joining this thread.

I appreciate following the suggestion of my colleagues to contact our QuickBooks Support.

I'm glad to let you know that we've received a recent update that the issue is fixed by our engineers.

If you're having the same error, I'd highly recommend contacting our Customer Support Team to re-investigate the issue about the error when creating estimates for projects. You can provide an investigation number INV-38910 to the representative as their reference.

Check out this article for future reference about organizing your project in QuickBooks Online: Introducing QuickBooks Projects: An Easy Way to Track Your Projects.

If you need anything else, please post a comment in Community. We are here to back you up. Have a good one!