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The cause to my problem is that my publishing message doesn't have the same row of array as my subscriber's. Hence, the node stop. To solve this, experts advised my to make custom message to carry the message that I want. I created msg file to carry two array that I want and it works. I would advise the readers to do the same to avoid from being frustrated in using Float32MultiArray like me. Just do custom message. Don't think too much about it. Goodluck!