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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def update_startup_byteman_script(self, byteman_startup_script):
 """ Update the byteman startup script, i.e., rule injected before the node starts. :param byteman_startup_script: the relative path to the script :raise common.LoadError: if the node does not have byteman installed """

        if self.byteman_port == '0':
            raise common.LoadError('Byteman is not installed')
        self.byteman_startup_script = byteman_startup_script
        self.import_config_files()