Why can't I add artboards using the New Artboard button in the Artboards panel?

Question

I cannot add artboards using the New Artboard button in the Artboards panel; I can only draw additional artboards with the artboard tool. I was able to create additional artboards earlier using the button in the panel, but suddenly (in one file) it stopped working and it displays the message "Cannot create artboard outside the canvas", even though I'm not attempting to create the artboards outside the canvas. I only ever had four artboards in the file. I deleted three of them, and now I can't even create a second artboard using the button. Even though I can use the artboard tool to create more artboards, my preference 99% of the time is to use the button in the panel. If I start a new file, the button allows me to create up to eight artboards. After the eighth, it then displays the "Cannot create..." message. But in the new file, I can delete the additional seven artboards and then add them back using the button. So I'm not sure what's preventing me from creating additional artboards using the button in my current file. Any help is appreciated! Thank you!

Answer 1

put the existing artboards to a location in the file where there's enough space to the right and down.