Reading Env variable from Jenkins through groovy script in soapui

ERROR [SoapUI] An error occurred [startup failed:
Script1.groovy: 4: unable to resolve class ParametersAction 
 @ line 4, column 53.
   ?.actions.find{ it instanceof Parameters
                                 ^
org.codehaus.groovy.syntax.SyntaxException: unable to resolve class ParametersAction 
 @ line 4, column 53.

The script I am running through soapui is given below. I need to read some variables from Jenkins for reporting.

import hudson.model.*

// get current thread / Executor
def thr = Thread.currentThread()
// get current build
def build = thr?.executable

// get parameters
def parameters = build?.actions.find{ it instanceof ParametersAction }?.parameters
parameters.each {   println "parameter ${it.name}:"   println it.dump()   println "-" * 80
}

// ... or if you want the parameter by name ...
def hardcoded_param = "BUILD_USER_LAST_NAME"
def resolver = build.buildVariableResolverdef hardcoded_param_value = resolver.resolve(hardcoded_param)println "param ${hardcoded_param} value : ${hardcoded_param_value}"