args is invalid option for customized docker agent in shared library using declarative pipeline

[niya...@gmail.com]

Below code works in my single jenkinsfile

stage('install') {

   agent {

       docker {

            image: <some golang image>

            args '-u root:root'

            reuseNode true

       }

   }

}

But when I tried to create a shared library, and put whole pipeline inside a library and used by another repo, it keeps complaining:

org.jenkinsci.plugins.workflow.cps.CpsCompilationErrorsException: startup failed:
Invalid config option "call" for agent type "docker". Valid config options are [image, alwaysPull, args, containerPerStageRoot, customWorkspace, label, registryCredentialsId, registryUrl, reuseNode] @ line 29, column 25.
                           args '-u root:root'

                           ^

if I disable the args, it go through correctly. Other options do works for me, except args, wondering any one have the same experience? 

shared library is in GoTest.groovy:

def call() {

    pipeline {

       ...

       that stage

       ...

    }

}

my call is like:

@Library('comm...@0.0.1') _

GoTest()