pipeline {
   agent none
   stages {
       stage ('INSTALL_IMAGE') {
           steps {
               script {
                   def command = "env.job_file --testbed-file env.testbed_file --image_file env.image_file --mail_to env.mail_to"
                   build job: 'PYATS_JOB_EXECUTOR', parameters: 
                    [
                        string(name: 'branch_name', value: env.branch_name),
                        string(name: 'pyats_job_args', value: ${command}),
                    ]
                }
            }  
        }
    }
}

获取此错误：job_file
job_filetestbed_fileimage_filemail_tobranch_name都是在Jenkins管道项目中定义的字符串参数。