testing server folder: /Applications/MAMP/htdocs/crowwatches2
maps to the
URL prefix: crowwatches2
"the site URL prefix [/crowwatches2] for the testing server does not match the site URL prefix  specified in the HTTP Address for the site. This may cause pages using site relative links to display incorrectly at runtime. Proceed anyway?"
is saying that this may cause a problem for site relative links only. you should proceed anyway.