[Plugin: Woo Product CSV Import Suite] Export Products > Failled – Network Error

I’m using Product CSV Import Suite (Woo Extension).
When I clicked “Export Products“, Google Chrome load a little bit and it said “Failled – Network Error” under Downloads Bar.
This error appeared after changing some things .htaccess, robots.txt yesterday.
I undo all these files (back to earlier vision), even I turn off WP Cache.. but it can not work normally.

Please help me!!