ERROR: Cannot load message class for [gps_common/GPSFix]. Are your messages built?
环境
Ubuntu18.04
ROS melodic/rosversion: 1.14.11
复现
rostopic echo /fix
BUG
ERROR: Cannot load message class for [gps_common/GPSFix]. Are your messages built?
原因
使用自定义的ros msg,需要在终端先source
解决