WHMCS Integration strange error when loading client area

Hello, I have a strange error message when I go to the client area on my site, the error reads “WHMCS appears to not be installed at client.clarcloud.com” checking both URLS in WHMCS and WordPress they both are the same “https://client.clarcloud.com”, the strange thing is refreshing the page and the error is gone, and the client area loads, this seems to be happening only when the site is first loaded when the browser is closed and opened again it displays the same error until refreshed.