Versions:

Minecraft: 1.12.2
Forge: 14.23.4.2703
CompatLayer (only if on Minecraft 1.10 or 1.11):
McJtyLib: 1.12-2.6.7-snapshot
RFTools: 1.12-7.33

Step 1, get an empty syring
Step 2, fill syring 100% with blizz
Step 3, place syring into a powered RFTools spawner
Step 4, read null error instead of spawn requirements.

Does your RFTools.cfg have an entry for the blizz? If not, add one and try again. If so, upload it.

This issue has been marked as needing a response from the reporter for over 2 weeks without receiving one. As such, it has been automatically closed.

What is the correct way to enter in a new mob to the config? I added the blizz to the config but am still getting nullRF.

Please post your attempt.

This was resolved in #1842.