Laravel Backpack Permission Manager Role Error

I've installed Laravel Backpack and also the Permission Manager. In the admin, I can access the permissions fine but when I try to access the roles,

SQLSTATE[HY093]: Invalid parameter number
select count(*) as total_rows from (select `roles`.`id`, (select count(*) from `users` inner join `model_has_roles` on `users`.`id` = `model_has_roles`.`model_id` where `roles`.`id` = `model_has_roles`.`role_id` and `model_has_roles`.`model_type` = ?) as `users_count` from `roles`) as `roles_aggregator`

All of the roles are in the DB and I can see that they have been assigned permissions but when I try to access mydomain.com/admin/role is when this error is thrown.

Thank You