Error when opening schematic

PCB Layout
1

I open a kicad 7 project.

Click on the schmatic icon.

I get a message that the schematic is open already. Nothing is open the the project main page.

The message gives me a choice of either opening it anyway with the warning that unexpected results may occur or canceling the attempt to open.

I have had to choose open anyway to get to the schematic page.

And sure enough, sometimes the drawing in the page is gone.

What is the cause of this message and how do I fix it?

2

It could just be bug? or probably this could case if you had multiple instance of KiCad opened or multiple version of KiCad Installed in the same system.