The challenge is to custom button Which opens the link to 'http://google.com/#q=<CONTACT NAME>' - where <CONTACT NAME> is the current contact's name. But to create the button link http://google.com/#q=<CONTACT NAME> it does demand.
So I tried the link: http://google.com/#q={!Account.Name}, where demand is correct. But while trying to complete the challenge shows the error:

This is my button:




How can I solve the problem?

The challenge is to custom button Which opens the link to 'http://google.com/#q=<CONTACT NAME>' - where <CONTACT NAME> is the current contact's name. But to create the button link http://google.com/#q=<CONTACT NAME> it does demand.
So I tried the link: http://google.com/#q={!Account.Name}, where demand is correct. But while trying to complete the challenge shows the error:

This is my button:




How can I solve the problem?