1、在ROS官网找到rqt_virtual_joy/plugin.xml，复制文件内容

<library path="src"> <class name="My Plugin" type="rqt_virtual_joy.virtual_joy_module.MyPlugin" base_class_type="rqt_gui_py::Plugin"> <description> An example Python GUI plugin to create a great user interface. </description> <qtgui> <group> <label>Robot Tools</label> </group> <!-- <group> <label>Subgroup</label> </group> --> <label>Virtual Joystick</label> <icon type="file">resource/input-gaming.png</icon> <statustip>Great user interface to provide real value.</statustip> </qtgui> </class> </library>

2.打开报错中指出的文件缺失的目录/opt/ros/melodic/share/rqt_virtual_joy/，新建文件plugin.xml

3.打开plugin.xml，粘贴第一步复制的代码，保存退出即可。