Multiple blocks not exporting

[efldo]

Hello,
While trying to use my world on blender, I tried using jmc2obj, however, some blocs become unknown, as much modded blocks as java blocks like the smooth quartz slab.
I looked at multiple people having similar issues but wasn't able to find a solution that worked for me.
If somebody could help me thanks in advance, I can give you this log if it helps:

Thank you in advance