Error creating SQL2008 trigger

I'm trying to create a trigger but am getting an error when it runs on the initial create.  I actually am simply modifying an existing trigger from another database with much of the same data but no errors.

The error is
Msg 273, Level 16, State 1, Procedure tr_trnUPS_EndOfDay_Insert, Line 13
Cannot insert an explicit value into a timestamp column. Use INSERT with a column list to exclude the timestamp column, or insert a DEFAULT into the timestamp column.


The code is

INSERT INTO DYNAMICS_EXT.dbo.trnUPS_EndOfDay_Detail
(      
      login_Name
    ,user_name
    ,spid
    ,hostname
    ,trnAction
      ,get_date
      , OrderNumber
      , Weight
      , MasterTrackingNumber
      , TrackingNumber
      , Cost
      , DateofShipment
      , ShipVia
      , CustomerName
      , Country
      , State
      , AccountNumber
      , TaxID
      , PostalCode
      , TS
      , Host
)
      
SELECT
      (system_user)login_Name
    ,(user)user_name
    ,(@@spid)spid
    ,(host_name())hostname
    ,('Insert')trnAction
      ,(getdate()) as get_date      
      , OrderNumber
      , Weight
      , MasterTrackingNumber
      , TrackingNumber
      , Cost
      , DateofShipment
      , ShipVia
      , CustomerName
      , Country
      , State
      , AccountNumber
      , TaxID
      , PostalCode
      , TS
      , Host
FROM INSERTED