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java.lang.NullPointerException: null	at org.kaaproject.kaa.server.appenders.file.appender.LogbackFileSystemLogger.append(LogbackFileSystemLogger.java:92)	at org.kaaproject.kaa.server.appenders.file.appender.FileSystemLogAppender.doAppend(FileSystemLogAppender.java:63)	at org.kaaproject.kaa.server.common.log.shared.appender.AbstractLogAppender.doAppend(AbstractLogAppender.java:74)	at org.kaaproject.kaa.server.operations.service.akka.actors.core.ApplicationLogActorMessageProcessor.lambda$processLogEventPack$0(ApplicationLogActorMessageProcessor.java:111)	at java.util.ArrayList.forEach(ArrayList.java:1249)	at org.kaaproject.kaa.server.operations.service.akka.actors.core.ApplicationLogActorMessageProcessor.processLogEventPack(ApplicationLogActorMessageProcessor.java:111)	at org.kaaproject.kaa.server.operations.service.akka.actors.core.ApplicationLogActor.onReceive(ApplicationLogActor.java:59)