C:\opt\ros\groovy\x86\share\roslaunch>roscore
WARNING: unable to configure logging. No log files will be generated
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Cannot locate [roslaunch]←[31mInvalid <param> tag: Cannot load command parameter [rosversion]: command [rosversion roslaunch] returned with code [1].
Param xml is <param command="rosversion roslaunch" name="rosversion"/>←[0m