G2XPL: It's been working, got most of California but suddenly...

What do I do about a missing resource file or an error in my log file:

• Failed to find resource 'terrain/g2xpl_17_24144_79568_4096.ter', referenced from scenery package 'Custom Scenery/z_g2xpl/'.
• The terrain file 'terrain/g2xpl_17_24144_79568_4096.ter' could not be located.

I removed the default scenery and readded it. I removed the DDS file and the error appeared. But strange that it doesn't appear until I try to take off from airport where the problem tile is.

I donated and so I have the latest version 6.90.