Question 
To pass this challenge, create a custom button which opens a link to 'http://google.com/#q=<CONTACT NAME>' - where <CONTACT NAME> is the current contact's name. Then add this button to the default 'Contact Layout'.The custom button must be named 'Google Info'.
The custom button must dynamically insert the contact's name using the appropriate merge field.
The custom button must be added to the 'Contact Layout' page layout.

For above question I am keep getting below error. I am able to get the result but trailhead is not verifying it.

Challenge Not yet complete... here's what's wrong:  There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: AIFEGHQY

Solution pls