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When you export a feature class from an ArcInfo 8.0.2 geodatabase to a coverage, ArcCatalog returns several "SHAPE Error(25) Column value could not be converted into a number or a date" errors. In other cases ArcCatalog will freeze up.
The conversion fails because of null values in a geodatabase numeric column. ArcInfo coverages do not support null values for numeric fields. ArcCatalog may hang because it cannot handle the number of error message lines created from the failed conversion.
Calculate the numeric fields with NULL values to 0.