exception:groovy.lang.MissingMethodException: No signature of method:

Working on my NetScan script for our Arista AP's still and when trying to execute a http [DELETE] I get the above error when following the Delete documentation here which suggests I can just call the URL and header.

Currently this is just using the collector debug !groovy command 

If I then try with blank payload I get a different error: exception:java.lang.NullPointerException

First Error with no payload in call: 

exception:groovy.lang.MissingMethodException: No signature of method: com.santaba.agent.groovyapi.http.Client.delete() is applicable for argument types: (java.lang.String, java.util.LinkedHashMap) values: [https://awm14001-c4.srv.wifi.arista.com/wifi/api/session, [Content-Type:application/json, ...]]
Possible solutions: delete(java.lang.String, java.lang.String, java.util.Map), release(), release(), close(), every(), get(java.lang.String)
java.lang.RuntimeException: groovy.lang.MissingMethodException: No signature of method: com.santaba.agent.groovyapi.http.Client.delete() is applicable for argument types: (java.lang.String, java.util.LinkedHashMap) values: [https://awm14001-c4.srv.wifi.arista.com/wifi/api/session, [Content-Type:application/json, ...]]
Possible solutions: delete(java.lang.String, java.lang.String, java.util.Map), release(), release(), close(), every(), get(java.lang.String)
	at com.logicmonitor.groovy.objects.BaseWrapper.invoke(BaseWrapper.java:124)
	at com.logicmonitor.groovy.objects.lang.ScriptWrapper.run(ScriptWrapper.java:31)
	at com.santaba.agent.groovy.executor.GroovyScriptShell.execute(GroovyScriptShell.java:71)
	at com.santaba.agent.util.GroovyScriptExecutor.execute(GroovyScriptExecutor.java:148)
	at com.santaba.agent.debugger.GroovyTask._executeInAgent(GroovyTask.java:210)
	at com.santaba.agent.debugger.GroovyTask._handle(GroovyTask.java:189)
	at com.santaba.agent.debugger.DebugTask.run(DebugTask.java:176)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: groovy.lang.MissingMethodException: No signature of method: com.santaba.agent.groovyapi.http.Client.delete() is applicable for argument types: (java.lang.String, java.util.LinkedHashMap) values: [https://awm14001-c4.srv.wifi.arista.com/wifi/api/session, [Content-Type:application/json, ...]]
Possible solutions: delete(java.lang.String, java.lang.String, java.util.Map), release(), release(), close(), every(), get(java.lang.String)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:71)
	at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:48)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:136)
	at Script85.run(Script85.groovy:76)
	at jdk.internal.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.logicmonitor.groovy.objects.BaseWrapper.invoke(BaseWrapper.java:118)
	... 9 more

Second Error with Blank Payload: 

exception:java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
	at com.logicmonitor.groovy.objects.BaseWrapper.invoke(BaseWrapper.java:124)
	at com.logicmonitor.groovy.objects.lang.ScriptWrapper.run(ScriptWrapper.java:31)
	at com.santaba.agent.groovy.executor.GroovyScriptShell.execute(GroovyScriptShell.java:71)
	at com.santaba.agent.util.GroovyScriptExecutor.execute(GroovyScriptExecutor.java:148)
	at com.santaba.agent.debugger.GroovyTask._executeInAgent(GroovyTask.java:210)
	at com.santaba.agent.debugger.GroovyTask._handle(GroovyTask.java:189)
	at com.santaba.agent.debugger.DebugTask.run(DebugTask.java:176)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.NullPointerException
	at com.santaba.agent.groovyapi.http.Client._processResponse(Client.java:580)
	at com.santaba.agent.groovyapi.http.Client.request(Client.java:429)
	at com.santaba.agent.groovyapi.http.Client.delete(Client.java:409)
	at com.santaba.agent.groovyapi.http.Client$delete$4.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:144)
	at Script91.run(Script91.groovy:76)
	at jdk.internal.reflect.GeneratedMethodAccessor68.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at com.logicmonitor.groovy.objects.BaseWrapper.invoke(BaseWrapper.java:118)
	... 9 more

The Code: 

/*******************************************************************************
*  Arista WIFI Integration with CUE for discovery of the AP's
 ******************************************************************************/

import com.santaba.agent.groovyapi.http.*
import com.santaba.agent.groovy.utils.GroovyScriptHelper as GSH
import com.logicmonitor.mod.Snippets
import com.santaba.agent.AgentVersion
import java.text.DecimalFormat
import groovy.json.JsonOutput
import groovy.json.JsonSlurper

// To run in debug mode, set to true
Boolean debug = false
// To enable logging, set to true
Boolean log = false

// Set props object based on whether or not we are running inside a netscan or debug console
def props
try {
    hostProps.get("system.hostname")
    props = hostProps
    debug = true  // set debug to true so that we can ensure we do not print sensitive properties
}
catch (MissingPropertyException) {
    props = netscanProps
}

//String key = props.get("AristaWIFI.api.key")
//String token = props.get("AristaWIFI.api.token")
//String clientId = props.get("AristaWIFI.api.clientId")
String key = [REMOVED]
String token = [REMOVED]
String clientId = "logicmonitor"
//if (!key) {
//    throw new Exception("Must provide AristaWIFI.api.key to run this script.  Verify necessary credentials have been provided in Netscan properties.")
//}
//if (!token) {
//    throw new Exception("Must provide AristaWIFI.api.token credentials to run this script.  Verify necessary credentials have been provided in Netscan properties.")
//}
//if (!clientId) {
//    throw new Exception("Must provide AristaWIFI.api.clientId credentials to run this script.  Verify necessary credentials have been provided in Netscan properties.")
//}
//def logCacheContext = "${org}::arista-wifi-cloud"
//Boolean skipDeviceDedupe = props.get("skip.device.dedupe", "false").toBoolean()
//String hostnameSource    = props.get("hostname.source", "")?.toLowerCase()?.trim()

Integer collectorVersion = AgentVersion.AGENT_VERSION.toInteger()
 
// Bail out early if we don't have the correct minimum collector version to ensure netscan runs properly
if (collectorVersion < 32400) {
    def formattedVer = new DecimalFormat("00.000").format(collectorVersion / 1000)
    throw new Exception("Upgrade collector running netscan to 32.400 or higher to run full featured enhanced netscan. Currently running version ${formattedVer}.")
}
externalHost= "awm14001-c4.srv.wifi.arista.com";

httpClient = HTTP.open(externalHost,443);
httpClient.setHTTPProxy('proxy.iggroup.local',8080);
// Log in to arista
loginurl = "https://awm14001-c4.srv.wifi.arista.com/wifi/api/session"

payloadstring = '{"type":"apiKeycredentials","keyId":"'+key+'","keyValue":"'+token+'","timeout":3600,"clientIdentifier": "'+clientId+'"}';


def payload = payloadstring;
println payload;
def loginResponse = httpClient.post(loginurl,payload,["Content-Type":"application/json"]);
if ( !(httpClient.getStatusCode() =~ /20/) )
{
    // Error has occured
    println "Authentication Failure";
    println httpClient.getStatusCode();
    println loginResponse;
    return(1);
}

String RawCookie = httpClient.getHeader("Set-Cookie")
//Have Kept but as yet not needed will remove if not needed..
String httpResponseBody = httpClient.getResponseBody()
//Retrieve the Cookie to use from the header.
AristaCookie = RawCookie.split(';')[0]
println httpClient.getStatusCode()
String cookieString = '"'+AristaCookie+'"'
def logoutheaders = ["Content-Type":"application/json","Cookie":cookieString]
//println logoutheaders
def logoutResponse = httpClient.delete(loginurl,logoutheaders) <- With No payload
def logoutResponse = httpClient.delete(loginurl,'{}'logoutheaders) <- With blank payload I have just tried "" as the payload as well.
logoutResult = httpClient.getStatusCode()
if ( !(httpClient.getStatusCode() =~ /20/) )
{
    //Error has occured
    println "Logout Failure";
    println httpClient.getStatusCode();
    println loginResponse;
    return(1);
}


println AristaCookie;
println httpResponseBody;
println logoutResponse;




def LMDebugPrint(message) {
    if (debug) {
        println(message.toString())
    }
}

The Same URL and the same header with no payload works if I work in python obviously appreciate they are different languages, just confirming that the formatting is correct.