Minecraft doesn't want to load my object file? (MCreator 2020.3 and Java 1.15.2)

The error:

32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 Caused by: net.minecraft.util.ResourceLocationException: Non [a-z0-9/._-] character in path of location: more_blocks:models/item/glassStairs.obs.mtl
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraft.util.ResourceLocation.<init>(ResourceLocation.java:30)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraft.util.ResourceLocation.<init>(ResourceLocation.java:30)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraft.util.ResourceLocation.<init>(ResourceLocation.java:39)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraft.util.ResourceLocation.<init>(ResourceLocation.java:39)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraftforge.client.model.obj.OBJModel.<init>(OBJModel.java:130)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraftforge.client.model.obj.OBJModel.<init>(OBJModel.java:130)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraftforge.client.model.obj.OBJLoader.lambda$loadModel$0(OBJLoader.java:86)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 at net.minecraftforge.client.model.obj.OBJLoader.lambda$loadModel$0(OBJLoader.java:86)
32:57.08 [Server-Worker-1/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:635 ... 39 more
33:57.08 [Server-Worker-1/WARN] [minecraft/ModelBakery]: Unable to load model: 'more_blocks:block/glass_stair' referenced from: more_blocks:glass_stair#: java.lang.RuntimeException: Could not read OBJ model

Full console log:

https://pastebin.com/2KB8aHtW

Oh!

Thanks

Sorry but its still showing the magenta and black block.

Any ways to fix this?

Also how to make the json version? (I don't know how to do it using json)

It is supposed to look like this:

When I opened one of the json on the Minecraft texture (inside the game .jar file) it shows this: (stone brick stairs)

{
    "parent": "block/stairs",
    "textures": {
        "bottom": "block/stone_bricks",
        "top": "block/stone_bricks",
        "side": "block/stone_bricks"
    }
}

Using the stair preset works but the texture is super weird:

I want it to use my edit texture so it will look at least more real