I have the statement <arg name="log_path" /> in a launch file which is later called in <param name="log_path" value="$(arg log_path)" />

Without any modifications to the launch file, I am getting this error in terminal arg 'log_path' is not defined. Arg xml is <arg name="log_path" value="$(arg log_path)"/> The traceback for the exception was written to the log file

One way to resolve would be to delete those lines. A better way would be to find the path to logfile as here: `<arg name="logpath" default="path/to/logFile" />`

Please tell me what are the ways to resolve this issue.