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I'm building a Ackermann Vehicle in Gazebo and therefore I implemented a custom hardware_interface for the gazebor_ros_control plugin.

Now I want to use a simple VelocityJointController in addition to the existing Controller for another functionality on the same robot. But when I try to launch everything, I get the following error

This controller requires a hardware interface of type 'hardware_interface::EffortJointInterface'. Make sure this is registered in the hardware_interface::RobotHW class"

I think that the default interfaces like EffortJoint-/JointState/- and VelocityJoint Interface aren't loaded. Does someone know how to fix this problem?

<gazebo>
    <plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
        <robotSimType>steer_bot_hardware_gazebo/SteerBotHardwareGazebo</robotSimType>
    </plugin>
</gazebo>
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