There must not be primary key / unique key in the target table and all the columns would be used as key columns. Since the new column doesn't exist in the trail file, then you got the error message.
You could add primary key/ unique key into the target table or use keycols to list all the columns except the newly added one.
MAP xxx , target xxx , keycols (col1,col2...);
thank you very much your quick response, Its fixed the issues as you suggested.
thanks a lot