500 Error when Deploying Website

Hi, I am facing an issue when I am updating my github repo (which is tied up to my web deployment) I am getting a random 500 error (as shown in the first image attached). This is happening when I deploy (push code onto my github repo) new code or when I deploy (copy the old code which was working before and pushed that back onto my github repo) previous version of the code before I made new changes (when the deployment was working fine). Only when I rollback the deployment to the old working version then my website would work and not have the 500 error. Also every push I make on cloudflare, log say its good and makes the build live without any issues. I have tried different deployment platforms (render and vercel, as shown in the second image attached) and I am not getting the same issue (any and all new deployments work and display our website live). Why is this happening? Would love any help or advice please!