Error: Unknown property 'core.email.template.EmailTemplateComponentController.Opportunity'
<messaging:emailTemplate subject="Closed Won Opportunity for {!relatedto.Account.Name} - Opportunity{!relatedto.Name}" recipientType="User" relatedToType="Opportunity"><messaging:htmlEmailBody ><html> <body>The following opportunity has been updated to Closed Won!<br></br> Account Name: {!Opportunity.Account} Opp. Name: {!Opportunity.Name} Opp. Owner: {!Opportunity.OwnerFullName} Type: {!Opportunity.Type} Close Date: {!Opportunity.CloseDate} 5 Year TCV: {!Opportunity.X5_Year_TCV_m__c} Sales - 5 Year TCV: {!Opportunity.Assumed_Rev_5_Year_TCV__c} Core Vendor: {!Account.Core_Vendor__c} Core Product: {!Account.Core_Product__c} OLB Vendor Name: {!Account.OLB_Vendor_Name__c} OLB Product Name: {!Account.OLB_Product_Name__c} Highest Stage Reached: {!Opportunity.Highest_Stage_Reached__c} View in Salesforce: {!Opportunity.Link}</body></html></messaging:htmlEmailBody ></messaging:emailTemplate>I edited the suggested ^^^.
But I am still getting this error
<messaging:emailTemplate subject="Closed Won Opportunity for {!Relatedto.Account.Name} - Opportunity{!Relatedto.Name}" recipientType="User" relatedToType="Opportunity">
<messaging:htmlEmailBody>
<html>
<body>
The following opportunity has been updated to Closed Won!
<br></br>
Account Name: {!Opportunity.Account}
Opp. Name: {!Opportunity.Name}
Opp. Owner: {!Opportunity.OwnerFullName}
Type: {!Opportunity.Type}
Close Date: {!Opportunity.CloseDate}
5 Year TCV: {!Opportunity.X5_Year_TCV_m__c}
Sales - 5 Year TCV: {!Opportunity.Assumed_Rev_5_Year_TCV__c}
Core Vendor: {!Relatedto.Account.Core_Vendor__c}
Core Product: {!Account.Core_Product__c}
OLB Vendor Name: {!Relatedto.Account.OLB_Vendor_Name__c}
OLB Product Name: {!Relatedto.Account.OLB_Product_Name__c}
Highest Stage Reached: {!Opportunity.Highest_Stage_Reached__c}
View in Salesforce: {!Opportunity.Link}
</body>
</html>
</messaging:htmlEmailBody >
</messaging:emailTemplate>