Web-socket client issue

[RSDhanu]

When I am trying with the switch sample code I am getting errors,
error: 'class IPAddress' has no member named 'toString'

return begin(host.toString().c_str(), port, url, protocol);
error: return-statement with a value, in function returning 'void' [-fpermissive]

return begin(host.toString().c_str(), port, url, protocol);
what's the problem

[Links2004]

most likely you are using the wrong board settings in the IDE