Common Issues with Workarounds

I can't log into the Control Panel

Did you try going to /cp instead of /admin?
Check your folder permission's: site local & statamic should likely be 774 or 777 if all else fails. Read More
Set the user's password:
(A) Navigate to yoursite.dev/cp then
(B) add password: yourpassword in {webroot}/site/users/admin.yaml and update email: to whatever you'd like to login with. update email is now optional since you can login with the admin user instead of using the email field.
(C) Refresh the CP login page and confirm that a new password_hash: was set in admin.yaml.
(D) Log in using your new credentials.