configuring jupyter dashboard server - jupyter-notebook

I want to create a jupyter dashboard server but when I click
File-> Deploy as-> Dashboard on jupyter dashboard server
I get the following error message
No dashboard server configured
I tried to look for a tutorial online but couldn't find one.
Can you please help me find a reference?
thanks.

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Yesterday, I was securing my website by adding SSL using the technique given by you. The link is given below
https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-16-04
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The screenshot is attached below

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installed php new version.(7.3)
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MAMP localhost filed leading to nothing

I've been running Wordpress locally and after updating to Catalina, I've run into a lot of problems accessing.
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Not Found
The requested URL was not found on this server.
If I go into http://127.0.0.1:8888/wordpress/, I receive an index of the seperate pages that I have created on my website, but receive the same not found error when I click on any links. I just want to be able to login to my Wordpress admin.

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[TypeError: Buffer.alloc is not a function]
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