Unable to populate Dropdown menu using extendedChoice parameter in Jenkins build Dynamically (using groovy script)

Question

Jenkins build with parameters option

Unable to find out why my groovy script is not running?

        parameters {
            extendedChoice(
                bindings: 'image=image', 
                defaultValue: '', 
                description: 'Build', 
                groovyClasspath: '', 
                groovyScript: '''
                        import groovy.json.JsonSlurper
                        import java.util.logging.Logger
                        logger.info("****####")
                        def result = 
                        "https://localhost:8080/$image/tag".toURL().text; 
                        def jsonSlurper = new JsonSlurper(); 
                        def object = jsonSlurper.parseText(result);
                        value = object[0].Value
                        println value
                        def decoded = value.decodeBase64()
                        return String(decoded), 
                multiSelectDelimiter: ',', 
                name: 'BUILD', 
                quoteValue: false, 
                saveJSONParameterToFile: false, 
                type: 'PT_SINGLE_SELECT', 
                visibleItemCount: 5)
        }