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You need to cast the date according to “load_date field” datatype(Date or datetime) shown bellow
ISNULL(load_date) ? (DT_DBTIMESTAMP)"01/01/1111" : load_date
I agree with Kiran although it's probably better to use the ISO format YYYY-MM-DD. Example: 1753-01-01 or 2011-11-30