Call parallel stages from a loaded file

[chencho m-a]

Hi all, 

I have this piece of code

def s
def workspace
pipeline {
  agent { label 'build_1804' }

  stages {
    stage('load functions') {
      steps {
        script{
          workspace = env.WORKSPACE
          node('build_1804') {
            s = load "${workspace}/regress/Jenkins_extension.groovy"   
          }
        }
      }
    }

    stage('Build and Test 1') {
        steps{
          script{
            s.buildandtest1(this)
          }
        }
     }
  }
}

And other file with:
def buildandtest1(Object s) {
  parallel {
            echo "Building test"
            echo "Calling test script..."
            sh """
              cd regress
              echo \"./do_standalone_wo_resnet50_2_58.sh\"
            """
          }
        }

    }
}

Dont put too much attention in {} or other syntax errors, i have modified 
the code to do it more readable. 

The main problem is that seems that jenkins is not able to start "parallel" 
stages when it is called from a method. I am getting this error. 

java.lang.IllegalArgumentException: Expected named arguments but got 
org.jenkinsci.plugins.workflow.cps.CpsClosure2@6a6de064    at 
org.jenkinsci.plugins.workflow.cps.DSL.singleParam(DSL.java:718)    at 
org.jenkinsci.plugins.workflow.cps.DSL.parseArgs(DSL.java:706)    at 
org.jenkinsci.plugins.workflow.cps.DSL.parseArgs(DSL.java:640)    at 
org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:234)


I have googled, but i dont find any solution or clue to fix it.

What am i missing ?

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