Cannot add namecheap

[amin9]

In the "Add Namecheap Account"

Its returning error: "The user and key combination appear to be invalid, or your Namecheap account may not be configured to allow API access."

I tried reset API Key.

Also talked with namecheap support. They found all ok from their end.

[Tyson]

When you save the credentials, the system tries to test the API by checking that the 'namecheap.com' domain exists by POSTing an API request to Namecheap with your credentials. However, Namecheap did not return an 'OK' response, or the system could not interpret the response. The module requires the libxml php extension to be enabled on the server, so you may want to double-check that it is.