A CraftTweaker script references something missing
Applies to Forge, NeoForge, Fabric, Quilt.
What it looks like in your log
Error executing scripts/recipes.zs: Could not resolve <item:minecraft:not_a_real_item>
What causes it
A .zs script references an item or mod that is not present on the server, often because the mod it targets is client-only or was removed.
How to fix it
crafttweaker.log names the script and line. Gate the script with #modloaded, restore the missing mod, or update the pack.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log