flume里面的channel选用了kafkaChannel报错

flume里面的channel选用了kafkaChannel，结果在flume启动的时候就报错了，报错的提示为：Error while getting events from Kafka. This is usually caused by trying to read a non-flume event. Ensure the setting for parseAsFlumeEvent is correct 但如果将channel改成memoryChannel却又能正常启动，想请教一下这是什么原因导致的？