@alexcarmad
Only thing I can see is the opening and ending tag mismatch ('<Item>' (start with capital 'I') & '</item>' (start with lowercase 'i')) in this line:

<Item>dlcpacks:\mpxmas_604490\</item>

It should be like this (both capital):

<Item>dlcpacks:\mpxmas_604490\</Item>

Or this (both lowercase):

<item>dlcpacks:\mpxmas_604490\</item>

to avoid a parsing error.

I'm not sure what effect this would have in-game though?! Let's see...

Tested: I can confirm that this opening and ending tag mismatch does indeed stop your add-ons (some anyway, tested quickly) from working.

Fix: Just change the lowercase 'i' at the end of the line to a capital 'I' & your add-ons should start working again