Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android

I am getting "net::ERR_UNKNOWN_URL_SCHEME" while calling a telephone number option from an HTML page in Android. Do I need to add any permission(s) in the manifest to get this working? I haven't added anything in the manifest so far. Here's the HTML Code: I am getting "net::ERR_UNKNOWN_URL_SCHEME" whi