Random Internal Server Error

Just set up a machine using the instructions (GitHub - frappe/bench: CLI to manage Multi-tenant deployments for Frappe apps). it worked yesterday. But today I came into the office to log in to the ERP and now it shows:


Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at you@example.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log."

Q .how do I trouble shoot this?