Multiple values submitted for field with name FieldName. The value Value in the field FieldName will be ignored.
This error occurs when submit more than one value in a column for a single item. For example, this error would occur if you submitted the values "true" and "false" in the "Autographed" field.
To fix this error, you should make sure you include only a single value in the column (field) indicated in the error message.