After installing WPL, there is an error message: "You don't have access to this part!" in the WPL menu.
To solve this error, you would need to add a WordPress user as a WPL user (normally your own user) and authorize the correct access level to the added user.
You can find this setting by following this path: WordPress back-end > WPL > User Manager
And following below KB Article will provide more information about user access level:
Also, your user should have access to "propertymanager" and "propertywizard" for managing listings. You can set these accesses for both users and memberships using User Manager and Memberships menu. You would need our Membership add-on for this purpose.