Trouble with Progression.xml mod

[kampnkarl]

Hey everyone, was testing ways to change base stats when you level agil and fort. I found you can do it easily for singleplayer, but these mods prevent others from connecting to your world, and will throw a null reference error. Any thoughts as to why these would cause that?

<append xpath="/progression/attributes/attribute[@name='attAgility']/effect_group">
    <passive_effect name="StaminaMax" operation="base_add" level="2,10" value="5,45"/>
</append>

 

<append xpath="/progression/attributes/attribute[@name='attFortitude']/effect_group">
    <passive_effect name="HealthMax" operation="base_set" level="2" value="110"/>
    <passive_effect name="HealthMax" operation="base_set" level="3" value="115"/>
    <passive_effect name="HealthMax" operation="base_set" level="4" value="120"/>
    <passive_effect name="HealthMax" operation="base_set" level="5" value="125"/>
    <passive_effect name="HealthMax" operation="base_set" level="6" value="130"/>
    <passive_effect name="HealthMax" operation="base_set" level="7" value="135"/>
    <passive_effect name="HealthMax" operation="base_set" level="8" value="140"/>
    <passive_effect name="HealthMax" operation="base_set" level="9" value="145"/>
    <passive_effect name="HealthMax" operation="base_set" level="10" value="150"/>
</append>
 

[bdubyah]

Where these changes made with a new game after, or did you add it to an existing save?