How to place a colored rectangle in background of part of a figure which has a logarithmic axis

I am trying to place a gray rectangle in the background of part of a figure. The figure has a logarithmic y-axis. I can place the rectangle just fine as long as I do not try to scale the axis. When I do that, I get the error message

Warning: Error updating Rectangle.
DataSpace or ColorSpace transform method failed.

Any suggestions? I have tried including the rectangle code before and after the rest of the commands for the figure.