Failed to write texture: Unknown ERROR !

Hello! 

When I export textures larger than 4k i get this:

  • resulting sprite sheet is 6616x4052

  • writing sprite sheet to D://a.png

  • and this ERROR: failed to write texture to D://a.png: Unknown error

Other sprite sheets smaller than 4k work perfect.

I haven’t saw anyone else to get this and I started this thread.

I export to css/png and my texture packer is 3.1.2