How to Fix an All of Create Aeronautics Server That Keeps Crashing
All of Create Aeronautics packs 50+ addons on top of NeoForge 1.21.1 to deliver airships and flying factories, which means crashes can come from several different directions — version mismatches, contraption-tracking overhead, addon interactions, or chunk desync during flight. Most reported issues trace back to a handful of well-known patterns rather than anything exotic, so working through them in order usually finds the cause faster than guessing.
See the All of Create Aeronautics pack page for the full RAM and setup breakdown before you chase anything else.
1. Confirm you're running Java 21
NeoForge 1.21.1 requires Java 21 to run at all. If your server is launching on an older runtime — a leftover Java 17 install from a previous modpack, or a host default that hasn't been updated — you'll either get an immediate failure to boot or a crash log that doesn't obviously point to the Java version as the cause. This is the fastest thing to rule out before investigating anything mod-related.
- Check the Java version your server process is actually using, not just what's installed on the machine
- Most managed hosts let you pick the Java runtime per server — confirm it's pinned to 21
2. Airship and contraption tick load
Create's mechanical systems already carry a real tick cost on their own, and Aeronautics adds continuous movement and collision tracking for every flying contraption on top of that. A large airship or flying factory moving through the world is effectively asking the server to keep recalculating physics for a big cluster of blocks every tick, which is a well-documented source of lag in Create-based packs even before you add flight.
If crashes or freezes correlate with a specific airship being airborne — rather than happening randomly — contraption size and complexity is the first thing to test by temporarily reducing it.
3. Addon interaction conflicts
With 50+ addons bundled into one pack, the odds of two specific addons stepping on each other's hooks are meaningfully higher than on a smaller, tightly curated pack. This doesn't mean any particular addon is broken — it means the surface area for an edge-case interaction is larger. If a crash log points at a specific mod or mixin rather than a generic tick timeout, that's usually a stronger lead than chasing RAM or Java settings further.
4. Airships crossing unloaded chunks
Flying contraptions crossing chunks that aren't loaded or force-loaded is a known source of desync in Create-flight packs. The contraption can end up partially simulated — some blocks updating, others frozen — which can produce strange crashes or silent freezes well after the airship has actually moved on. Keeping flight paths within force-loaded or well-traveled chunks, or using chunk-loading tools where the pack supports them, reduces how often this comes up.
5. RAM under the pack's realistic floor
8 GB is the real floor for All of Create Aeronautics, not a generic Create-pack estimate — 50+ addons plus the extra contraption-tracking overhead from flight push memory needs above what a smaller tech pack would need. Running under that floor rarely causes a single clean crash. More often it shows up as creeping lag and garbage-collection pauses that get worse over a session, especially during airship takeoff or landing, until the server finally misses enough ticks to time out and crash — which can look unrelated to RAM in the log unless you're watching memory usage at the time.
FAQ
Why does my All of Create Aeronautics server crash specifically when an airship takes off or lands?+
Takeoff and landing are the moments when the game has to recalculate collision and movement for every block in the contraption at once, on top of normal Create mechanical tick cost. If the airship is large or built with dense machinery, that spike can push a server with marginal RAM or CPU headroom over the edge. Try testing with a smaller airship first to confirm it's a scaling issue rather than a specific addon conflict.
Is Java 21 actually required for All of Create Aeronautics, or can I use an older version?+
Yes — NeoForge 1.21.1 requires Java 21. Running an older Java runtime (like Java 17 or Java 8) will either fail to launch at all or produce confusing crash logs that don't clearly point to the real cause. This is one of the first things to check before digging into mod-specific theories.
How much RAM does All of Create Aeronautics actually need to run smoothly?+
8 GB is the realistic floor for this pack given its 50+ addons and the extra tracking overhead from flying contraptions. Running below that doesn't always produce a clean out-of-memory crash — more often it shows up first as creeping lag and garbage-collection pauses that eventually cascade into a tick timeout, which can look like an unrelated crash in the logs.
Host All of Create Aeronautics on hardware sized for its real floor
All of Create Aeronautics needs a genuine 8 GB floor to handle 50+ addons and airship contraption tracking without cascading lag, and a quick backup before testing any addon or config change means a bad crash never costs you progress.
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