Unable to find a specification for CouchbaseLite-Enterprise (~> 2.0.0)

Thank you. I tried that first,

pod ‘CouchbaseLite-Swift-Enterprise’, ‘~> 2.1.6’

$ pod install

Analyzing dependencies

[!] Unable to find a specification for CouchbaseLite-Swift-Enterprise (~> 2.1.6)

This is NOT working.

Then, when i was going through the below forum i got some steps, which i had doubt whether correct or not.

This is NOT working as well.