Your "Password was incorrect" problem is because "GMail" identifies "Evolution" as a less secure app, so doesn't provide authentication to the app. You can change this feature if you want, https://www.google.com/settings/security/lesssecureapps
But if you don't want to allow your email access to evolution, you can remove your gmail account in evolution by following these steps
Open Evolution
Edit
Preferences
Select your email account, then press "delete"
This should remove your email account from evolution and no more signing in troubles anymore.
