Solved mine as well. Thank you!
I copied my project from a different computer that had unreal engine on it. The new computer said “do you want to rebuild?”. Chose yes. It rebuilt. Then started the editor. When the editor loading reached 71% it gave me that error.
Deleted binaries like you said. Opened epic launcher, opened the project. Got the rebuild prompt again. Built. Editor loaded past 71%. My project opened. Success!
I had input bindings that disappeared (Im sure it’s due to the copy pasting from PC to PC not because of the deleted binaries) and broke some blueprints in the process. But that’s minor. Nevertheless it happened. So I thought I’d note it here while im writing. Thank you