MacBook Pro won't connect to Wi-Fi, with correct password. Error: "The Wi-Fi network requires a WPA2 password"
I just had the same issue.  The answer I found online said to go to system preferences, then network, then click advanced and then click TCP/IP and click the Renew DHCP Lease; but I don't think that did anything.

However, instead of clicking TCP/IP, stay on the Wi-Fi page (or go back to it by clicking the tab) and click the + button to add the network.  You need the network name and password, and for security I chose WPA2 personal.  Apply or Click OK and that should do it.  It worked for me and now I get connected automatically.