Armor - Unable to fit - try a lower resolution resourcepack

This error is caused by the fact that you have too many custom armors or/and that their texture is too large (HD textures, for example).

This is a limitation of the game, I currently cannot do anything about that. Every plugin that creates custom armors using shaders tricks has the same issue.

If you are on 1.21.2 or greater (both client and server) you can use the new method to create armors. The new method doesn't have this issue.

Caught error loading resourcepacks, removing all selected resourcepacks
java.util.concurrent.CompletionException: z: Stitching
    at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315)
    at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320)
    at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:649)
    at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
    at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1773)
    at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1800)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: z: Stitching
    at heo.a(SpriteLoader.java:146)
    at heo.lambda$loadAndStitch$8(SpriteLoader.java:212)
    at java.base/java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:646)
    ... 8 more
Caused by: hr: Unable to fit: minecraft:entity/equipment/humanoid_leggings/leather - size: 7936x128, atlas: 4096x8192
z, atlasMax: 8192x8192 - Maybe try a lower resolution resourcepack?