Error at Data Flow Task [Excel Destination [6804]]: Columns......cannot convert between unicode and non-unicode string data types.

I have tried making the columns dt_str and dt_wstr in the derived column editor but does not fix the error. I am trying to copy data from a table (ole DB Source) to an excel spreadsheet (Destination).  Changing the datatypes does not seem to make a difference. MSSQL 2008 R2.