编译的时候出现错误

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学习ROS2基础入门课程4.2-2编译测试python话题发布者出现错误，使用colcon build 编译的时候出现

Summary: 0 packages finished [1.36s]
  1 package failed: xuexi
  1 package had stderr output: xuexi
[1.875s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_notification.desktop_notification.notify2' is declared multiple times, 'colcon_notification.desktop_notification.notify2:Notify2DesktopNotification' overwriting 'colcon_notification.desktop_notification.notify2:Notify2DesktopNotification'
[1.875s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_notification.desktop_notification.notify_send' is declared multiple times, 'colcon_notification.desktop_notification.notify_send:NotifySendDesktopNotification' overwriting 'colcon_notification.desktop_notification.notify_send:NotifySendDesktopNotification'
[1.875s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_notification.desktop_notification.terminal_notifier' is declared multiple times, 'colcon_notification.desktop_notification.terminal_notifier:TerminalNotifierDesktopNotification' overwriting 'colcon_notification.desktop_notification.terminal_notifier:TerminalNotifierDesktopNotification'
[1.875s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_notification.desktop_notification.win32' is declared multiple times, 'colcon_notification.desktop_notification.win32:Win32DesktopNotification' overwriting 'colcon_notification.desktop_notification.win32:Win32DesktopNotification'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.bat' is declared multiple times, 'colcon_core.shell.bat:BatShell' overwriting 'colcon_core.shell.bat:BatShell'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.dsv' is declared multiple times, 'colcon_core.shell.dsv:DsvShell' overwriting 'colcon_core.shell.dsv:DsvShell'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.sh' is declared multiple times, 'colcon_core.shell.sh:ShShell' overwriting 'colcon_core.shell.sh:ShShell'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.powershell' is declared multiple times, 'colcon_powershell.shell.powershell:PowerShellExtension' overwriting 'colcon_powershell.shell.powershell:PowerShellExtension'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.zsh' is declared multiple times, 'colcon_zsh.shell.zsh:ZShell' overwriting 'colcon_zsh.shell.zsh:ZShell'
[1.904s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.shell.bash' is declared multiple times, 'colcon_bash.shell.bash:BashShell' overwriting 'colcon_bash.shell.bash:BashShell'
[1.918s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.prefix_path.colcon' is declared multiple times, 'colcon_core.prefix_path.colcon:ColconPrefixPath' overwriting 'colcon_core.prefix_path.colcon:ColconPrefixPath'
[1.930s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.prefix_path.colcon' is declared multiple times, 'colcon_core.prefix_path.colcon:ColconPrefixPath' overwriting 'colcon_core.prefix_path.colcon:ColconPrefixPath'
[1.943s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.prefix_path.colcon' is declared multiple times, 'colcon_core.prefix_path.colcon:ColconPrefixPath' overwriting 'colcon_core.prefix_path.colcon:ColconPrefixPath'
[1.957s] ERROR:colcon.colcon_core.extension_point:Entry point 'colcon_core.prefix_path.colcon' is declared multiple times, 'colcon_core.prefix_path.colcon:ColconPrefixPath' overwriting 'colcon_core.prefix_path.colcon:ColconPrefixPath'
invalid syntax (<unknown>, line 1)
yujian@ubuntu:~/ros2_ws$