HOW CAN I OPEN RVİZ

[Minaygt]

Body

[ERROR] [joint_state_publisher_gui-1]: process has died [pid 49472, exit code -15, cmd '/opt/ros/foxy/lib/joint_state_publisher_gui/joint_state_publisher_gui --ros-args'].

also my_robot.urdf

<material name="green">  
    <color rgba="0 0.5 0.1" />
<material>

 <link name="base_link"> 
     <visual>
         <geometry>
             <box size="0.6 0.4 0.2" />  
         <geometry>
         <origin xyz"0 0 0" rpy="0 0 0" /> 
         <material name="green" />     
     <visual>       
 <link>

Guidelines

• I have read and understood this category's guidelines before making this post.