org.xwiki.rendering.macro.MacroExecutionException: Failed to evaluate Script Macro for content [// Add participants to a meeting  
// Optionally send a mail from template including an additional note

import com.xpn.xwiki.plugin.mailsender.Mail;
import java.util.ArrayList;

def success = true;
def error = "";
def participants;
def meeting = request.meeting;
def nbUsers = 0;
def nbMails = 0;
def mailSent = false;
def meetingDoc;
def toAddr = "";

  meetingDoc = xwiki.getDocument(request.meeting)
  meeting = meetingDoc.getObject("MMCode.MeetingClass")

 if (request.emails && request.emails!="") {
  toAddr = request.emails
  def extra = request.mailnote;
  def fromAddr = xwiki.getXWikiPreference("admin_email")
  def ccAddr = null
  def bccAddr = null

  templateDoc = xwiki.getDocument(request.template)
  templateObj = templateDoc.getObject("XWiki.Mail", "language", (xcontext.language==null) ? "" : xcontext.language);
  if (templateObj == null)
   templateObj = templateDoc.getObject("XWiki.Mail")
  templateDoc.use(templateObj) 

  // Prepare mail template context
  vcontext = xcontext.get("vcontext")
  vcontext.put("meetingTitle", meetingDoc.title)
  vcontext.put("meetingURL", meetingDoc.getExternalURL())
    
  textContent = xwiki.parseContent(templateDoc.getValue("text"))
  htmlContent = xwiki.parseContent(templateDoc.getValue("html"))
  subject = xwiki.parseContent(templateDoc.getValue("subject"))

  // decorate text/HTML content with extra note.
  if (!extra.equals("")) {
    def args = new ArrayList();
    args.add(xwiki.getUserName(meetingDoc.creator, false))
    intro = msg.get("meetings.mail.personalnote", args)
    textContent += ("\n\n" + intro + "\n\"" + extra + "\"")
    htmlContent += ("<br /><br />" + intro + "<br />\"" +extra + "\"<br />")
  }

  // TODO: ultimately the code below should be merged in the mailsender plugin
  vcontext.put("from.name", fromAddr);
  vcontext.put("from.address", fromAddr);
  vcontext.put("to.address", toAddr);
  vcontext.put("to.cc", ccAddr);
  vcontext.put("to.bcc", bccAddr);
  vcontext.put("bounce", fromAddr);

  Mail mail = new Mail();
  mail.setFrom((String) vcontext.get("from.address"));
  mail.setTo((String) vcontext.get("to.address"));
  mail.setCc((String) vcontext.get("to.cc"));
  mail.setBcc((String) vcontext.get("to.bcc"));
  mail.setSubject(subject);
  mail.setTextPart(textContent);
  mail.setHtmlPart(htmlContent);
  
  try {
    xwiki.getPlugin("mailsender").getProtectedPlugin().sendMail(mail, xcontext.context);
    mailSent = true;
  } 
  catch (Exception e) {
    success = false;
    error = e.message
  }
 }

 // the mail was sent with success or was not needed
 // we should now add the participants to the meeting
 // and send back the HTML to represent the current participants
 if (success) {
   participants = request.participants.split(",")
   if (participants) {
    for (participant in participants) {
      def obj = meetingDoc.newObject("MMCode.MeetingParticipantClass")
      obj.set("username", participant)
      obj.set("participation", "undecided")
      nbUsers++;
    }
   }
   meetingDoc.save();
   println "SUCCESS ${meeting} ${nbUsers} ${mailSent} ${nbMails} ${toAddr}";
 } else {
   println "ERROR ${meeting} ${nbUsers} ${mailSent} ${nbMails} ${toAddr}:" + error;
 }]
	at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:174)
	at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:52)
	at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:190)
	at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:57)
	at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:184)
	at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:129)
	at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:72)
	at com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:7483)
	at com.xpn.xwiki.doc.XWikiDocument.performSyntaxConversion(XWikiDocument.java:7432)
	at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:835)
	at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:783)
	at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:878)
	at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:546)
	at sun.reflect.GeneratedMethodAccessor252.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:493)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:196)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:161)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:116)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1912)
	at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1856)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1833)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:860)
	at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:270)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:252)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:332)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:212)
	at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:247)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:196)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:161)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:116)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1912)
	at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1856)
	at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:226)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:117)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:152)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:218)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:291)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:774)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:703)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:896)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:595)
Caused by: javax.script.ScriptException: Cannot invoke method split() on null object
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:117)
	at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.eval(AbstractJSR223ScriptMacro.java:277)
	at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:209)
	at org.xwiki.rendering.macro.script.AbstractJSR223ScriptMacro.evaluateBlock(AbstractJSR223ScriptMacro.java:169)
	... 95 more
Caused by: javax.script.ScriptException: Cannot invoke method split() on null object
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:318)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:111)
	... 98 more
Caused by: java.lang.NullPointerException: Cannot invoke method split() on null object
	at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
	at org.codehaus.groovy.runtime.callsite.NullCallSite.call(NullCallSite.java:32)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:124)
	at Script374.run(Script374.groovy:82)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:315)
	... 99 more