ubuntu14.04 ROS indigo
問題：
執行查看指定消息的命令，出現下面的錯誤提示，找不到該消息類型。
~$ rostopic echo /speech/command
ERROR: Cannot load message class for [speech_control/command]. Are your messages built?
解決：
將ros 工作空間中的 devel 和 build 兩個文件夾刪除，然后重新編譯，執行 catkin_make，即可。
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