This is what ava gives as an error.
F:\umodel>umodel.exe "F:\Program Files\AVA\avaGame\Content\Environments\Ava_Tile.upk"
Detected game root F:/Program Files/AVA/avaGame/Content
Found 289 game files (0 skipped)
Loading package: F:\Program Files\AVA\avaGame\Content\Environments\Ava_Tile.upk Ver: 451/52 Engine:
2719 Names: 172 Exports: 108 Imports: 25
******** F:\Program Files\AVA\avaGame\Content\Environments\Ava_Tile.upk ********
*** ERROR: assertion failed: size >= 0 && size < (256<<20)
appMalloc:size=1901532203 <- FArray::Empty <- FString<< <- ReadNameTable <- UnPackage::UnPackage:F:\
Program Files\AVA\avaGame\Content\Environments\Ava_Tile.upk <- Main