Shared Home Switch is Closed

We're brand new to the Linuxcnc world and have run into a problem. After we load one of our .ngc files and attempt to "home" the simulator, we get the following faults:

Cannot home while shared home switch is closed j=2
Cannot home while shared home switch is closed j=0

We simply want to run the G-code in simulation. We are not currently connected to a physical machine. I have included a screen-shot of our issue. What does this fault mean?

Also, is there a user manual or examples to use the simulator only mode of linuxcnc?

Hello, it means that the axes X and Z are not set to home, you only have marked as the Y as ok.
regards

Thank you for the quick response. We'll look at these solutions.

<It might be that the simulated home switches in the sim config have got in a tangle.>

If so, how do we correct it?

<Does the same thing happen if you quit and restart LinuxCNC? Is there any chance that you stopped the machine part-way through the homing process?>

Yes and I don't think we have.

<Hello, it means that the axes X and Z are not set to home, you only have marked as the Y as ok.
regards>

OK. But interestingly our homing errors don't occur every time. Sometimes it will home, sometimes it doesn't.

Now if we invoke Linuxcnc, de-select the Estop, Toggle Machine ON, then Home with the default Linuxcnc Engraving file loaded, it will Home just fine and occasionally run the code when we tell it to. Other times we get what you see in the attached file.

If I am not mistaken the standard Lcnc splash file is imperial inches, have you set it up for metric! As this is not a homing problem Lcnc is trying to go out side the limits.

Looks like you are making the classic basic mistake.
This might help www.palleteer.uk/projects/cnc-setup/