[SOLVED][LIBGDX] android load file from json

[Unandro]

I load json

Gdx.files.classpath("assets/Json/DamageText.json")

in this file I load font

"com.badlogic.gdx.graphics.g2d.BitmapFont": {
        "ubuntu": { "file": "assets/Font/ubuntu.fnt" }
    },

In desktop this is work, but in android I have FATAL EXCEPTION: GLThread

com.badlogic.gdx.utils.SerializationException: Error reading file: assets/Json/DamageText.json
Caused by: com.badlogic.gdx.utils.SerializationException: Error reading file: assets/Json/DamageText.json
Caused by: com.badlogic.gdx.utils.SerializationException: Font file not found: assets/Font/ubuntu.fnt

How I can fix it?