the message say the error.
Positon not rechabilty.
check position from path with "jump assign robot" or reach test.
is the path in ps (graphic viewer) correct and reachabilty check your machine data files.
lot of movement problems is attributable to incorrect machine data.
with RCS the limits which are included in robot mada are activated.
The message tells you that the position is not reachable.
In this case it looks like the position is out of limits.
With "jump to location" or "without RCS" it is not a problem but as soon as you activate RCS module the robot cannot move to the location because of the limits.
Manipulate your location to allow the robot to reach the location.