Discord.js bot on server dont start

I have a server for my discord bots, to host my bots i use the package pm2. When I hosted the first bot everything worked fine, but when I uploaded the 2nd bot, it no longer found the ./handlers folder, when I then tried further commands with pm2 the first bot also worked at some point (after 5 days of running time ) no longer. What is the reason and how can I fix this error? (The folder is in the same folder from which it is also called)