RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: no such command [['/opt/ros/noetic/share/xacro/xacro.py', '/home/gouming/catkin_ws/src/smartcar/urdf/smartcar.urdf.xacro']].
时间: 2023-07-01 16:27:43 浏览: 157
这看起来像一个ROS的异常。它告诉我们,它无法加载一个名为 `robot_description` 的参数,因为它没有找到命令 `['/opt/ros/noetic/share/xacro/xacro.py', '/home/gouming/catkin_ws/src/smartcar/urdf/smartcar.urdf.xacro']`。可能的原因是,你的ROS系统没有正确配置,或者你没有正确设置 `smartcar.urdf.xacro` 文件的路径。你可以检查一下你的ROS环境,或者确认一下你的 `smartcar.urdf.xacro` 文件是否存在于指定的路径中。
相关问题
RLException: Invalid <param> tag: Cannot load command parameter [robot_description]: command [['/opt/ros/noetic/lib/xacro/xacro', '/home/wangyize/catkin_ws/src/smartcar/urdf/smartcar.urdf.xacro']] returned with code [2]. Param xml is <param name="robot_description" command=" $(arg urdf_file)"/> The traceback for the exception was written to the log file
这个错误是由于在launch文件中的`<param>`标签中,`command`参数的值无效导致的。具体地,`command`参数的值应该是一个有效的命令行字符串,用于加载参数的值。在你的launch文件中,`command`参数的值是`$(arg urdf_file)`,这个值没有被解析成一个有效的命令行字符串。因此,你需要修改`command`参数的值,将其设置为一个有效的命令行字符串,用于加载`robot_description`参数的值。
你可以将`command`参数的值修改为以下形式:
```
<param name="robot_description" command="$(find xacro)/xacro --inorder '$(find smartcar)/urdf/smartcar.urdf.xacro'"/>
```
这个命令使用xacro工具来解析你的URDF文件,并将结果作为`robot_description`参数的值。请注意,你需要安装ROS的xacro工具才能使用这个命令。此外,你还需要确保`smartcar.urdf.xacro`文件位于`smartcar`软件包的`urdf`目录下。
如果你仍然遇到问题,请检查命令行输出和启动日志,以获取更多信息。
RLException: Invalid <node> tag: package must be non-empty.
This error is typically encountered in the context of an XML file or configuration file. The <node> tag is used to define a node or element within the file, and it is telling you that the "package" attribute for this particular node is empty or missing.
To fix this error, you need to ensure that the package attribute is properly defined for the <node> tag. This attribute should contain a non-empty value that identifies the package or namespace for the node.
For example, if you are working with an AndroidManifest.xml file, the <node> tag might look something like this:
<node
name="MainActivity"
label="@string/app_name"
icon="@drawable/ic_launcher"
package="com.example.myapp" />
In this case, the package attribute is set to "com.example.myapp", which is the package name for the app. Make sure that your <node> tags have a similar package attribute that is properly set.
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