Hi All,

I have created a trigger on attachment. When I run it, it is giving an errror tht attachment body cannot be null.

trigger CTC_AttachmentDelete on Attachment (after delete) {

public list<Attachment> errorAttachments = new list<Attachment>();
public list<Attachment> updateAttachments = new list<Attachment>();
public list<CaseHistory> caseHistoryList = new list<CaseHistory>();

// Get the current user's profile name
Profile prof = [select Name from Profile where Id = :UserInfo.getProfileId() ];

// If current user is not a System Administrator, do not allow Attachments to be deleted
if (!'System Administrator'.equalsIgnoreCase(prof.Name)) {
for (Attachment a : Trigger.old) {
a.addError('You do not have permission to delete attachments.');
//page.addmesage();
}
}
else{

for(Attachment a : Trigger.old){

try{
//CaseHistory ch = new CaseHistory();
//ch.CaseId = a.ParentId;
//caseHistoryList.add(ch);

Deleted_Attachments__c dAttach = new Deleted_Attachments__c();
dAttach.Case__c = a.ParentId;

system.debug('case history list before insert is: '+dAttach);
insert dAttach;

Attachment attach=new Attachment();
Blob bodyString = a.Body;
attach.Body=bodyString;
attach.Name=a.Name;
attach.ContentType=a.contentType;
attach.ParentID=dAttach.Id;

system.debug('attachment before insert: '+attach+' old attachment is: '+a);
insert attach;

delete a;
}

catch(DmlException dex){
system.debug('exception while deleting attachment'+ dex);
}
}

/**if(caseHistoryList.size()>0){

try{
system.debug('case history list before insert is: '+caseHistoryList);
insert caseHistoryList;
}
catch(exception ex){
system.debug('error that occured while inserting caseHistoryList: '+ex);
}

}**/

}
}