I've been trying to control a gazebo simulation but this warning keep appering

Controller Spawner couldn't find the expected controller_manager ROS interface.

I was able to spawn my robot on gazebo and rviz before added on my urdf the gazeboroscontrol plugin and the transmissions ,so The problem must have been after that. I've added the libgazeboroscontrol like this:

<!-- ros_control plugin -->
<gazebo>
    <plugin name="gazebo_ros_control" filename="libgazebo_ros_control.so">
        <robotNamespace>/arm_robot</robotNamespace>
    </plugin>
</gazebo>

so on my spawner i've put the same namespace to match. like this:

<?xml version="1.0" encoding="UTF-8"?>
<launch>
    <include file="$(find gazebo_ros)/launch/empty_world.launch" />

    <param name="arm_description" command="cat $(find arm_description)/urdf/arm_description.urdf" />

    <node name="urdf_spawner" pkg="gazebo_ros" type="spawn_model" respawn="False" output="screen" args="-urdf -param arm_description -model arm_robot" />

    <!-- Load controllers -->  
    <rosparam command="load" file="$(find arm_description)/config/joints_controllers.yaml" />

    <!-- Controllers -->
    <node name="controller_spawner" pkg="controller_manager" type="spawner" respawn="false" output="screen" ns="/arm_robot" args="--namespace=/arm_robot
            joint_state_controller
            joint1_position_controller
            joint2_position_controller
            joint3_position_controller
            --timeout 60">
    </node>
</launch>

In another ROS Answer (https://answers.ros.org/question/214712/gazebo-controller-spawner-warning/) and on gazebosim tutorial is said that the namespace is what gives the most trouble. honestly, I don't know how to move forward from this point.

my project is on https://github.com/DMPatod/industrial_robot_proj