I got problem about Workout connected with gym equipment.

Hello. I got problem about Workout connected with gym equipment. I can't connect Apple Watch with gym equipment. I don't know what happened with my watch because I can use it before , but now I can't.

When I want to workout such as run on treadmill. I will bring a watch to tap with workout connect on treadmill and it not have any respond.

Please help me. I want to fix it to normally and became perfect watch.