//  Code :

trigger AddDesctoAccount on Account (Before Update) {
 
    Id userId= userinfo.getUserId();
    User UserDetails = [select Id,Username from User where Id= :userId ];
    String uName= UserDetails.Username;
   List<Account> actToUpdate = new List<Account>();
    for(Account acc: Trigger.new){
        actToUpdate.add(acc);
    }
    
    for(Account act: actToUpdate){
        act.Description=uName;
    }
    
    database.update(actToUpdate,false);
    
}




Output:

Error: Invalid Data. 
Review all error messages below to correct your data.
Apex trigger AddDesctoAccount caused an unexpected exception, contact your administrator: AddDesctoAccount: execution of BeforeUpdate caused by: System.SObjectException: DML statement cannot operate on trigger.new or trigger.old: Trigger.AddDesctoAccount: line 15, column 1



Please Help me with the code.


Thank You,
Prasad

//  Code :

trigger AddDesctoAccount on Account (Before Update) {
 
    Id userId= userinfo.getUserId();
    User UserDetails = [select Id,Username from User where Id= :userId ];
    String uName= UserDetails.Username;
   List<Account> actToUpdate = new List<Account>();
    for(Account acc: Trigger.new){
        actToUpdate.add(acc);
    }
    
    for(Account act: actToUpdate){
        act.Description=uName;
    }
    
    database.update(actToUpdate,false);
    
}




Output:

Error: Invalid Data. 
Review all error messages below to correct your data.
Apex trigger AddDesctoAccount caused an unexpected exception, contact your administrator: AddDesctoAccount: execution of BeforeUpdate caused by: System.SObjectException: DML statement cannot operate on trigger.new or trigger.old: Trigger.AddDesctoAccount: line 15, column 1



Please Help me with the code.


Thank You,
Prasad