The errors you post point to a problem in the Testing Server Section of your site definition.
Specifically the URL Prefix.
From the error, you have set the URL prefix to "http://127.0.0.1", it sounds like this is not a valid URL to serve pages using MAMP.
Try using localhost instead
this assumes that your site files are in the root of the MAMP htdocs directory, if the are in a sub folder of the MAMAP htdocs folder, you will need to include that sub folder name in the URL prefix as well. For example, if you site files are at htdocs/mySite the URL prefix needs to be mySite