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I am trying to get the Blob Version Data from the ContentVersion in Apex class and send it in an Email using the Following Code:

 Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
      Messaging.Emailfileattachment efa1 = new Messaging.Emailfileattachment();
    if(typeo == 'SalesForce Error')
    {
         List<id> ContentDocumentids = new List<id>();

         for(contentDocumentLink CDLink : [SELECT LinkedEntityid, ContentDocumentid FROM contentDocumentLink WHERE LinkedEntityid=:RecordID])
        {
           ContentDocumentids.add(CDLink.ContentDocumentid);  
        }
    
    /* GET Data for the image */
    ContentVersion cv = [SELECT title,PathOnClient, FileType,
                                                versiondata 
                                          FROM contentversion 
                                          WHERE ContentDocumentId IN :ContentDocumentids  
                                           ];
          Blob Data = cv.VersionData;
      
        if(Data.size()>0)
        {
          efa1.setBody(Data);
          efa1.setFileName(Cv.Title);
            
          Mail.fileattachments.add(efa1); // This line is throwing the Error 
        }
         
    }

I have confirmed that there is in fact a file related to the ID that's being sent out but for some reason it's giving me the following Error:

execution of AfterUpdate caused by System.NullPointerException: Attempt to de-reference a null object 

What am I doing wrong? am I using the wrong information for attachment

UPDATE-- Afer doing Checkpoints I see there is Data in CV, but Mail.addatt atchment isnt able to add, it keeps showing null values see image below:

enter image description here?

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Best answer

Okay I figured it out, I was using a SingleEmailMessage object, and according to this documentation I have to add an attachment using the following code:

email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});

instead of doing Mail. attachment

This worked!

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