Create Crash: Cannot use IServerWorld#getWorld in a client environment

What it looks like in the log

java.lang.IllegalStateException: Cannot use IServerWorld#getWorld in a client environment

How to fix it

1. If the crash occurs when opening a Create Ponder screen, check the crash log right below SchematicWorld for locks.mixins.json:TemplateMixin and remove or update the Locks mod.
2. If the crash occurs when holding or positioning a Schematic, move or delete the offending .nbt file from your Minecraft schematics folder (or remove the Schematic item from your inventory using an NBT editor) to stop the client preview.
3. Re-record your Schematic without capturing multiblocks, cables, or networked blocks from other tech mods like Immersive Engineering or Refined Storage, and place those components manually after building the structure.
4. Inspect the stack trace lines directly beneath SchematicWorld.func_201672_e to identify any other mod or Mixin hooking into Template placement, and update both Create and that mod to the latest build available for your Minecraft version.

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