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[ERROR] [1686540341.656331436]: Failed to load nodelet [/vesc/high_level/ackermann_cmd_mux] of type [ackermann_cmd_mux/AckermannCmdMuxNodelet] even after refreshing the cache: Could not find library corresponding to plugin ackermann_cmd_mux/AckermannCmdMuxNodelet. Make sure the plugin description XML file has the correct name of the library and that the library actually exists. [ERROR] [1686540341.656401879]: The error before refreshing the cache was: Could not find library corresponding to plugin ackermann_cmd_mux/AckermannCmdMuxNodelet. Make sure the plugin description XML file has the correct name of the library and that the library actually exists. [FATAL] [1686540341.656599888]: Failed to load nodelet '/vesc/high_level/ackermann_cmd_mux` of type `ackermann_cmd_mux/AckermannCmdMuxNodelet` to manager `ackermann_cmd_mux_nodelet_manager' [ERROR] [1686540341.658449305]: Failed to load nodelet [/vesc/low_level/ackermann_cmd_mux] of type [ackermann_cmd_mux/AckermannCmdMuxNodelet] even after refreshing the cache: Could not find library corresponding to plugin ackermann_cmd_mux/AckermannCmdMuxNodelet. Make sure the plugin description XML file has the correct name of the library and that the library actually exists. [ERROR] [1686540341.658478764]: The error before refreshing the cache was: Could not find library corresponding to plugin ackermann_cmd_mux/AckermannCmdMuxNodelet. Make sure the plugin description XML file has the correct name of the library and that the library actually exists. [FATAL] [1686540341.658664845]: Failed to load nodelet '/vesc/low_level/ackermann_cmd_mux` of type `ackermann_cmd_mux/AckermannCmdMuxNodelet` to manager `ackermann_cmd_mux_nodelet_manager'

这是一个ROS机器人操作系统中的错误信息，具体是关于节点加载的问题。看起来节点 `/vesc/high_level/ackermann_cmd_mux` 和 `/vesc/low_level/ackermann_cmd_mux` 的类型是 `ackermann_cmd_mux/AckermannCmdMuxNodelet`，但是在加载时出现了找不到库文件的错误。建议确认一下插件描述的XML文件中库文件的名称是否正确，并且库文件是否存在。