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I Found the problem and each time I compiled the code, it couldn't found the .srv file. when I wanted to import a service file from another package into a python node, I should first write the package name and the folder name inside that. After that, I use the file name for importing. Like:

from dynamixel_controllers.srv import TorqueEnable

dynamixel_controller is the name of the package that I want to import file from that and inside the folder srv there is a file named TorqueEnable.