Issue description: Placing an Evoker seringe in a Spawner crashed the server. Starting it in solo or on a server crashes it instantly.

Steps to reproduce: Just plopped down the Spawner, powered it, introduced the seringe and everything crashed.

Versions:

• Minecraft: 1.12.2
• Forge: forge-1.12.2-14.23.5.2838-universal
• CompatLayer (only if on Minecraft 1.10 or 1.11):
• McJtyLib: 1.12-3.5.3
• RFTools: 1.12-7.71

Possibly incompatible mods and versions:
so far haven't encountered another issue with RFTools, used the Spawner before as well. Playing on the Twitch launcher Ragnamod V pack.

Relevant logs, if any:
https://pastebin.com/gMbibPYX

Thanks for the help

E: added McJtyLib version.

See if deleting the rftools.cfg and letting it regenerate with defaults fixes it.

So that means that someone (you? pack maker?) tried to add a spawn recipe for the Evoker, but didn't do it right. If you restore and post the old config, I can try to find what's wrong with it.

I deleted the rftools.cfg as you said and restarted the server for it to generate.

I crafted a new spawner, and upon inserting the syringe I get this :

I connected it to my RF system :

No recipe but at least it doesn't crash the whole server.
Is it intended ?

I'm playing on the Ragnamod V modpack. Is it possible to change it myself ? I can't seem to find anything regarding the spawn config for the evocation_illager in the rf tools config files.

This is the old config that crashed the server : https://pastebin.com/xYfTdRP4

Ive been playing stoneblock 2 and had the same issue but with a pink slime. Said NullRf then shut down the internal server.

Can anyone who's had this problem manage to reproduce it with just McJtyLib and RFTools installed?

As described in #1981, #1987, and #2007 it seems that pack makers(?) are not configuring the spawner requirements properly for mobs from other mods?

I just discovered these threads when I tried to spawn Natura:Imp in FTB Revelations and got the same crash about no "recipe". My server now crashes immediately upon startup. I will try resetting rftools.cfg, but is it possible to make a failsafe of some kind that will catch the error without crashing the entire server?

Thanks!

PS. This is only somewhat related and I can open a new issue if needed, but the recipe for syringe doesn't seem to be in JEI.

I repeat:

Can anyone who's had this problem manage to reproduce it with just McJtyLib and RFTools installed?

If so, then please post the config that caused the problem. If not, then figure out which other mod is actually breaking it. Without this being done, there's basically nothing we can do.