If you try to export the sql database from wamp to a normal database, you might get this error “Utf8mb4_unicode_520_ci“.
To fix it, just replace: utf8mb4_unicode_520_ci with utf8mb4_unicode_ci.
You can do a find and replace from Dreamweaver or Notepad++ (which is a free program).
Replace all the values and then try to import the sql database again. It should work now.