Problem with exporting FBX file with multiple materials and UV Maps I'm trying to export FBX file to Substance Painter with multiple materials and multiple UVs merged together (merged under one name) I have vertex groups for them and materials.

When I'm trying to export selection only this Error pops up : https://imgur.com/a/8YAAB



Heres link to blend file: https://mab.to/aXVEW8bPC

Thanks in advance for any anwsers
I was trying to export FBX and said error was poping up. It was 3 objects with 3 different UV maps on one MAP ( i think its called UV Atlas). 3 materials all assigned even had vertex group for each one. After multiple trys i separated all of the objects and started exporting them one by one. It appears UV map on one of them wouldnt let the whole model to export. I tried with materials as i heard that un assigned materials can prevent you from exporting... i tried saving to obj and than back to fbx still nothing. I made new seams (cause i found in error info multiple UVIndex mentions) and unwrapped it once more and it exported. Simply as that.