what is the format of Kafka data that ksql require?

[lucentcosmos]

Hello I did not use your QuickStart data generator. I tried to use my own Kafka data.

I have the following error:
Input record ConsumerRecord ....
has invalid (negative) timestamp. Possibly because a pre-0.10 producer client was used to write this record to Kafka without embedding a timestamp, or because the input topic was created before upgrading the Kafka cluster to 0.10+. Use a different TimestampExtractor to process this data.

I wonder how ksql with Kafka data other than the one you generated?