[Webtest] MissingMethodException: "no signature of method" in antbuilder config

[Mulder Patrick]

I am having a problem with antbuilder use and canoo webtest. When I
try out the following code I get the following exception that I don't
understand and cannot find ideas on internet:

Exception:

  Caught: groovy.lang.MissingMethodException: No signature of method:
groovy.util.ConfigObject.call() is applicable for argument types:
(java.util.LinkedHashMap) values: [[host:www.google.com, port:80,
protocol:http, basepath:]]
        at test$_run_closure3.doCall(test.groovy:60)
        at test$_run_closure3.doCall(test.groovy)
        at test.run(test.groovy:59)


Code:

  config_map = ['host':'www.google.com', 'port':'80',
'protocol':'http', 'basepath':'']

  ant.testSpec(name:'groovy: Test Groovy Scripting at creation time'){
    config(config_map)
    steps(){
        invoke(url:'linkpage.html')
        for (i in 1..10){
            verifyText(description:"verify number ${i} is on pages",
text:"${i}")
        }
    }
  }

thank you if you can help

patrick
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