Fixed missing class error

src/Database/Models/OrganisationMembershipApproval.php

@@ -26,7 +26,7 @@ use UserFrosting\Sprinkle\Core\Database\Models\Model;
  * @property int      $approver_id
  */
 
-class OrganisationMembershipApproval
+class OrganisationMembershipApproval extends Model
 {
     /**
      * @var string The name of the table for the current model.