"No Numeric Values on X-Axis" pop-up... How to rid?

[#1]

See below. I have two charts layered on top of one another. I don't want to show the x-axis on the top layer because it sometimes overlaps when I change the filters. How to I eliminate the warning you see in the middle of the chart?

[#2 · Accepted solution]

Silly me.. All I had to do was make the x-axis font white in the background chart and now it's perfect.