ERROR: cannot launch node of type [turtlesim /turtlesim

出现问题：

ROS在roslaunch时编译正常，运行时显示错误如下：

ERROR: cannot launch node of type [turtlesim /turtlesim_node]: turtlesim
ROS path [0]=/opt/ros/melodic/share/ros
ROS path [1]=/home/cyx/demo03_ws/src
ROS path [2]=/opt/ros/melodic/share
ERROR: cannot launch node of type [turtlesim /turtlesim_node]: turtlesim
ROS path [0]=/opt/ros/melodic/share/ros
ROS path [1]=/home/cyx/demo03_ws/src
ROS path [2]=/opt/ros/melodic/share

排查过程：

1.首先确定roscore过了

2.确定catkin_make、resource过了

3.检查cmakelist和package文件没有问题

4.检查launch文件，

发现pkg=“turtlesim ”多了一个空格。

注意：

实在找不出来问题所在时，注意核对代码格式以及内容，这些catkin_make时不会报错，但并不代表没有错误。

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