Hello,

I have an Apex Trigger that I am trying to deploy through Change Sets from Sandbox to Production. It is a field update on the opportunity object. It works fine in Sandbox, and when I run tests I get 100% test coverage. However when I try to "validate" in the inbound change sets section in production I get errors like this: 

These Classes are from years ago, not even sure that they're still in use. I am new to deploying apex and not sure what they mean? Can someone help explain is this something to be concerned about? Can I ignore the test classes? Is it my code that is causing the issue? My code is below: 

trigger SF_Opportunity on Opportunity (before insert, before update) {
    
    //Change the Opportunity_Manager__c so the field is up to date with the current Opportunity Owner's Manager. 
    for (opportunity o : Trigger.new) {
        //get a list of the user object from the opportunity owner. 
        List<User> oppOwner = [select managerid, name, UserRole.name from user where user.id =: o.ownerid];
        system.debug('USER LIST ***' + oppOwner);
    for (user oppOwn : oppOwner){
            //update the fields based on the id of the opportunity owner
          o.Opportunity_Owner_Manager__c = [select name from user where user.id =: oppOwn.managerid].name;
          o.Opp_Owner_Role__c = [select name from UserRole where UserRole.id =: oppOwn.UserRoleID].name;
        }
  }
}

Thanks for the help, again I am new to this just trying to learn as much as I can.

Thanks!