Errors can be caused by an incorrect formula in a cell, a badly executed ‘copy and paste’ or any number of other pitfalls, such as ensuring links between documents are maintained.
Gall gwallau gael eu hachosi gan fformiwla anghywir mewn cell, ‘copi a gludo’ ar gam neu nifer o beryglon eraill, megis sicrhau bod dolenni rhwng dogfennau yn cael eu cadw.