I have created a component that is using a custom class.  I added this component to an email template.  When I try and load the template this is the error message I receive. List has no rows for assignment to SObject. From what I can tell the attribute I have created is not passing the value to my class.

Also, when I first pull up the task page to send an email, the OpportunityID is part of the querystring with a key of p3_lkid. However, when I select the template the querystring is reset.  I have enclosed the relevant code below.

Component

 <apex:component access="global" controller="ProbeQuoteEmail">
<apex:attribute name="opportunityID"
description="This is the ID of the opportunity."
type="ID" assignTo="{!opportunityID}" />

<apex:repeat value="{!ProbeProducts}" var="p">
<p>{!p.ProductFamily__c}</p>
<table border='1'>
<apex:repeat value="{!p.OpportunityLineItems}" var="line">

<tr>
<td ><apex:outputText value="{!line.Quantity}"/></td>
<td ><apex:outputText value="{!line.PricebookEntry.Name}"/></td>
<td align="right"><apex:outputField value="{!line.UnitPrice}"/></td>
<td align="right"><apex:outputField value="{!line.TotalPrice}"/></td>
</tr>

</apex:repeat>
</table>
</apex:repeat>

</apex:component>

Email Template

<messaging:emailTemplate subject="Your requested quote n° {!relatedTo.Id}" recipientType="Contact" relatedToType="Opportunity">
<messaging:plainTextEmailBody >
Dear {!recipient.name},
        
        Thank you for your continued interest in our offering. Please see the attached quote per your request.
        
        Feel free to contact me if you have any questions.
        
        Regards,
        {!$User.FirstName} {!$User.LastName}

</messaging:plainTextEmailBody>
    <messaging:attachment renderAs="pdf" filename="{!relatedTo.name}">          

    <c:ProbeQuoteProducts opportunityID="{!relatedTo.Id}"/>

    </messaging:attachment>      
    

</messaging:emailTemplate>

Apex Class

public class ProbeQuoteEmail {
    Schema.DescribeFieldResult F = Product2.Family.getDescribe();
    List<Schema.PicklistEntry> P = F.getPicklistValues();
    
    public Opportunity Probe { get; set; } 
     
    public Id opportunityID { get; set; } 
    
    public List<Opportunity> ProbeProducts = new List<Opportunity>();
    
    Integer Counter = 1; 

    public ProbeQuoteEmail() {
                       
        for (Schema.PicklistEntry fam:P){
            Integer i = 0;
            String FamilyLabel = fam.GetLabel();
        
            Probe = [SELECT o.Id, o.Name, o.Amount, o.ProductFamily__c, (SELECT op.Quantity, op.UnitPrice, op.TotalPrice,
                      op.PricebookEntry.Name, op.OpportunityId, op.PricebookEntry.ProductCode, 
                      op.PricebookEntry.Product2.Family, op.LineCount__c  
                      FROM OpportunityLineItems op WHERE op.PricebookEntry.Product2.Family = :FamilyLabel) 
                      FROM Opportunity o where Id = :opportunityID];
                
               Probe.Amount = 0; 
               Probe.ProductFamily__c = FamilyLabel;
                      
               for(i=0;i<Probe.opportunityLineItems.size();i++) {
                    Probe.Amount += Probe.opportunityLineItems[i].TotalPrice;   
                    Probe.opportunityLineItems[i].LineCount__c = Counter;
                    Counter++;
               }
        
            ProbeProducts.add(Probe);
        }
    }

    public List<Opportunity> getProbeProducts() {
        return ProbeProducts;
    }
    

}