the balancer parameters print error

public String toString() {
return String.format("%s.%s [%s," + " threshold = %s,"
+ " max idle iteration = %s," + " #excluded nodes = %s,"
+ " #included nodes = %s," + " #source nodes = %s,"
+ " #blockpools = %s," + " run during upgrade = %s,"
+ " hot block time interval = %s]"
+ " sort top nodes = %s",
Balancer.class.getSimpleName(), getClass().getSimpleName(), policy,
threshold, maxIdleIteration, excludedNodes.size(),
includedNodes.size(), sourceNodes.size(), blockpools.size(),
runDuringUpgrade, sortTopNodes, hotBlockTimeInterval);
}

print error.