My board looks pristine without any damage as can be seen here: https://drive.google.com/file/d/1EivfCJdLwdnEPcx9NiT12BoVghCPYpMO/view?usp=sharing (including a link to a high resolution pic).
I think the error has something to do with power supply issue. I have measured on each TTL chip's VCC...