I am trying to create a VisualForce Email Template, related to the Case Object. In the template, I wish to include the email correspondence we had with the customer as a thread. Below are the Apex Class, Controller, and VF Email Template I assembled. Currently, I am receiving the below error trying to test the template: 
Apex Class - 'CaseEmailExtension':
public with sharing class CaseEmailExtension { public CaseEmailExtension() {} private final Case currentCase; public CaseEmailExtension(ApexPages.StandardController currentcase) { this.currentCase = (Case)currentcase.getRecord(); } public List<EmailMessage> getSortEmails(){ List <EmailMessage> sortedEmails = new List<EmailMessage>(); sortedEmails = [SELECT Id, FromAddress, ToAddress, BCCAddress, MessageDate, Subject, HasAttachment, Incoming, HtmlBody, CreatedBy.Name //, (Select Id, Name from Attachments) --> attachments are not needed at the separate emails from EmailMessage where ParentId =: currentCase.Id order by MessageDate DESC ]; return sortedEmails; } } VisualForce Component - 'CaseEmailExtension':
<apex:component controller="CaseEmailExtension" access="global"> <apex:attribute name="caseId" type="Id" description="Case Id" /> <table border = "1"> <apex:repeat value="{!sortEmails}" var="email"> <apex:facet name="header"> <apex:outputText value="{0,date,dd'.'MM'.'yyyy HH:mm:ss z}" style="font-weight:bold;font-style:italic;font-size:15px;float:left"> <apex:param value="{!email.MessageDate}" /> </apex:outputText> </apex:facet> <table width="100%"> <tr> <td width="70%" align="left"> <table cellpadding="2px"> <tr> <td width="50px" align="right"><b>From: </b></td> <td align="left"><i><apex:outputText value="{!email.FromAddress}"/></i></td> </tr> </table> </td> <td width="30%" align="right"> <b>{!IF(email.Incoming,"INCOMING", "OUTGOING")}</b> </td> </tr> <tr> <td width="70%" align="left"> <table cellpadding="2px"> <tr> <td width="50px" align="right"><b>To: </b></td> <td align="left"><i><apex:outputText value="{!email.ToAddress}"/></i></td> </tr> </table> </td> </tr> <tr> <td width="70%" align="left"> <table cellpadding="2px"> <tr> <td width="50px" align="right"><b>BCC: </b></td> <td align="left"><apex:outputText value="{!email.BccAddress}"/></td> </tr> </table> </td> <td width="30%" align="right"> </td> </tr> <tr> <td width="70%" align="left"> <table cellpadding="2px"> <tr> <td width="50px" align="right"><b>Subject: </b></td> <td align="left"><apex:outputText value="{!email.Subject}"/></td> </tr> </table> </td> <td width="30%" align="right"> <table cellpadding="2px"> <tr> <td width="80px" align="right"><b>Created by: </b></td> <td align="left"><i><apex:outputText value="{!email.CreatedBy.Name}"/></i></td> </tr> </table> </td> </tr> </table> <br/> <br/> <table> <tr> <td width="70%" align="left"> <table cellpadding="2px"> <tr> <td width="50px" align="right"><b></b></td> <td align="left"><apex:outputField value="{!email.HtmlBody}"/></td> </tr> </table> </td> <td width="30%" align="right"> <table cellpadding="2px"> <tr> <td width="80px" align="right"><b></b></td> <td align="left"><i></i></td> </tr> </table> </td> </tr> </table><br/> </apex:repeat> </table> </apex:component> And the VisualForce Email Template - 'VF [autoresponse] End-User Auto Closing Email':
<messaging:emailTemplate subject="test" recipientType="Contact" relatedToType="Case"> <messaging:htmlEmailBody > <html> <body> <b><u>Case Emails:</u></b> <br /> <c:CaseEmailExtension caseId="{!relatedTo.Id}"/> </body> </html> </messaging:htmlEmailBody> </messaging:emailTemplate> 
