在rviz显示机器人的章节中，出现找不到文件的错误

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import launch
import launch_ros
from ament_index_python.packages import get_package_share_directory
#import os
import launch_ros.parameter_descriptions
#import urdf_tutorial_path

def generate_launch_description():

#获取默认的urdf
 urdf_package_path = get_package_share_directory('fishbot_description')
 #default_urdf_path = os.path.join(urdf_package_path,'urdf','first_robot.urdf'
 default_model_path = urdf_package_path + '/urdf/first_robot.urdf'

 
#为launch申明参数， 声明一个urdf目录的参数，方便修改
 action_declare_arg_mode_path = launch.actions.DeclareLaunchArgument(
 name='model',default_value=str(default_model_path),description='URDF的绝对路径'
 )
#通过文件路径，获取内容，并转换成参数对象，以供转入 robot_state_publisher
 robot_description =launch_ros.parameter_descriptions.ParameterValue(launch.substitutions.Command(['cat ',launch.substitutions.LaunchConfiguration('model')]),value_type=str)

#状态发布节点
 robot_state_publisher_node = launch_ros.actions.Node( package='robot_state_publishers',
                                                        executable='robot_state_publisher',
                                                        parameters=[{'robot_description':robot_description}])

#关节状态发布节点
 joint_state_publisher_node = launch_ros.actions.Node( package='joint_state_publisher',
                                                         executable='joint_state_publisher')

#rviz节点
 rviz_node = launch_ros.actions.Node(package='rviz2',
                                    executable='rviz2')
 
 return launch.LaunchDescription([action_declare_arg_mode_path,
                                  joint_state_publisher_node,
                                  robot_state_publisher_node,
                                  rviz_node])

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运行日志
[INFO] [launch]: All log files can be found below /home/abc/.ros/log/2025-07-28-18-23-08-186688-abc-30399
[INFO] [launch]: Default logging verbosity is set to INFO
[ERROR] [launch]: Caught exception in launch (see debug for traceback): "package 'robot_state_publishers' not found, searching: ['/home/abc/桌面/chapt7/chapt7_ws/install/fishbot_description', '/opt/ros/humble']"