problem about autocomplete

Hi:

I meet an unrecognized problem; The append is the snippet of my codes:

            if(table2.Rows.Count>0)
            table1.Merge(table2);
            DataView view = table.DefaultView;
            view.RowFilter = string.Format("testing"+" like '{0}%'", prefixText);

I have two table, and each have the same column like "testing"; 

when user click word and invoke autocomplete, sometimes, the error meesage shows at debug mode:

Function.emptyFunction = Function.emptyMethod = function Function$emptyMethod() {
    /// <summary locid="M:J#Function.emptyMethod" />
    if (arguments.length !== 0) throw Error.parameterCount();
}

I can not image what is the problem, since the codes is correct; is that possbile to find out the problem and 

fix it, Thanks a lot.