When loading a data pack with functions, I get a series of errors in the console, and the functions fail to load:

[17:15:08] [ForkJoinPool.commonPool-worker-6/ERROR]: Couldn't load function at long_day:functions/config.mcfunction
java.util.concurrent.CompletionException: java.lang.NullPointerException
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) ~[?:1.8.0_51]
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:604) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443) [?:1.8.0_51]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) [?:1.8.0_51]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_51]
Caused by: java.lang.NullPointerException
at net.minecraft.server.MinecraftServer.aL(SourceFile:1449) ~[MinecraftServer.class:?]
at pp.f(SourceFile:185) ~[pp.class:?]
at br.a(SourceFile:48) ~[br.class:?]
at pp.a(SourceFile:147) ~[pp.class:?]
at pp$$Lambda$1440/166190643.apply(Unknown Source) ~[?:?]
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) ~[?:1.8.0_51]
... 6 more

Full set of errors: fail.txt

The data pack works fine in vanilla: trixieverse_pack.zip