You provided no keys, but the bucketed hash store was not checked

[binarybit10]

I'm providing a bucketed hash store as shown below. The bucketed hash store size is 4480113. It works for a different set of keys.

Also, the program hangs after the exception, it's not being terminated correctly due to running threads?

 store = new BucketedHashStore<>(TransformationStrategies.rawByteArray(), outputPath.getParent().toFile());
 // adding 4480113 keys to store in a loop
 store.add(hash);

     mph = new GOVMinimalPerfectHashFunction.Builder<byte[]>()
                    .store(store)
                    .build();

Caused by: java.lang.IllegalStateException: You provided no keys, but the bucketed hash store was not checked
    at it.unimi.dsi.sux4j.mph.GOVMinimalPerfectHashFunction.<init>(GOVMinimalPerfectHashFunction.java:466)
    at it.unimi.dsi.sux4j.mph.GOVMinimalPerfectHashFunction$Builder.build(GOVMinimalPerfectHashFunction.java:271)

[binarybit10]

I replaced java HashSet that has the keys with ObjectOpenCustomHashSet<byte[]> with hash strategy and it worked.