failing to open dataproc cluster jupyterlab

[AnthonyMatovu]

Dear,

I am failing to open Jupyterlab of a dataproc cluster GCP with an error of 

This page isn’t working right now.

europe-west1.dataproc.cloud.google.com can't currently handle this request.

HTTP ERROR 502

Help how can I overcome this; I don't have recent back of the code there.

Thank you.

Anthony