What happens:

After starting a server, this warnings show for every recipe that isn´t from EnderIO, but can be made in Alloy Smelter. I don´t know if this can affect my server (lag spikes, crashing server etc.), but I want to be sure that my server is safe :)

• EnderIO: 1.12.2-5.0.33
• EnderCore: 1.12.2-0.5.39
• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.5.2768-universal
• Optifine: yes
• Server

Just this, which has to be created on 1st launch of mod (I don´t edit it):

<?xml version="1.0" encoding="UTF-8"?>
<enderio:recipes xmlns:enderio="http://enderio.com/recipes" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://enderio.com/recipes recipes.xsd ">
</enderio:recipes>

Just some warnings from forge. Not a big deal.

Edit do you have anything in user_recipy.xml?

not a big deal then.. just forge being forge