[UHOH]: something unexpectedly went wrong

[Whatever0w0]

so I've done a 3d model in Blender and it was all going smoothly until I went to export it into .litematic, giving me the error above, looking at the console it says this:

Error: Invalid mapping index
at t.ASSERT (/bundle.worker.js:2:1392573)
at /bundle.worker.js:2:1209969
at Array.forEach ()
at t._createBlockBuffer (/bundle.worker.js:2:1209840)
at t._encodeBlockBuffer (/bundle.worker.js:2:1210409)
at t._createBlockStates (/bundle.worker.js:2:1210079)
at t._convertToNBT (/bundle.worker.js:2:1211201)
at t.export (/bundle.worker.js:2:1209398)
at e.export (/bundle.worker.js:2:1429801)
at Object. (/bundle.worker.js:2:1424169)

I'll leave the obj file in the form of txt in a zip file, the palette file from the page, and some screenshots
block-palette.txt
minecraftbase.zip






and the material colors are:
0xFFFFFF alpha:1
0x008FB3 alpha:0.5
0x737373 alpha:1
0x00941E alpha:1
my computer is an HP Omen 16 laptop with an AMD Ryzen 7 5800H CPU with RADEON graphics, 16 GB of DDR4 PC4-25600 3200MHz Non-ECC SODIMM RAM, and an NVIDIA GeForce RTX 3050 Ti laptop GPU and uses Windows 11 home version latest update as of today