{% hint style="warning" %} MMOItems blocks are not compatible with ItemsAdder and vice versa. {% endhint %}
You have to open the config.yml
file of ItemsAdder and disable REAL blocks (mushroom).
{% code title="config.yml" %}
disable-REAL: true
{% endcode %}
{% hint style="info" %} After applying this change you won't be able to create ItemsAdder blocks with type: REAL.
Other ItemsAdder custom block types will still work (for example REAL_NOTE). {% endhint %}