503 Service Unavailable

Hi all!

I have a problem with my droplet. I get this error when i want to login my cyberpanel i see 503 service unavaliable The server is temporarily busy, try again later! error.

I login to my server with ssh and i see this error:

https://prnt.sc/u4hgru

I restart my droplet and everything is seems to fine. I shouldnt get this error, so how can i fix this??

thanks!