MakerFr.com

no I don't think that's the problem.
but could it be that my calibration and probe position is outside my work area ??

yes probably.

Have you set the dimensions in the GRBL parameters.
They must be correct if software limits are activated.

i used universal gcode sender, which has a wizard to calibrate your cnc.
Is there any other way ???

The commands to change GRBL parameters are explained here:
https://github.com/gnea/grbl/wiki/Grbl- ... figuration

you can send the commands manually using Arduino serial terminal (or put them in a file that you execute like a Gcode file).

sorry but I don't find anywhere where you can put the dimensions in but what I did notice I get the error message as soon as it has reached the calibration or the probe position

I FOUND IT !!!!!
I have disabled the soft limits ($ 20) and I am no longer getting an error
is there any drawback with disabling this?

parameters $130 up to $132 set the max travel of the axes.
Usualy (convention) , cnc works with negative Mpos coordinates. E.g. Z=0 is when Z is on top against the limit switch. When Z goes down, Z Mpos coordinate become negative. When softlimit is activated, GRBL check that Z does not exceed $132.
Same principle applies on other axis.
Note: X=0 is (by convention) when X reach a limit switch on the rigth and X is negative when X move to the left.
Still when there is only a limit switch on the left side, GRBL allows to perform a Home moving to the left. When limit switch is reached, it set X Mpos to minus $130 (- some margin). When softlimit is ON, GRBL checks that X Mpos does not become positive.
Same principle applies for Y.

When softlimit is disabled, GRBL does not check anymore if some travel exceed the machine on the side where there is no end switch.