What are the different types of errors and what do they mean?
There are at least 3 different types of error messages that you may encounter when using the pages. The first type, the data checking errors, will normally come as a pop-up window with a message saying that, for example, the data you've just typed is outside the allowed range, or that it does not match some other information elsewhere on the page. Most of these messages should be self-explanatory. Some prevent you from entering invalid data. Others are only intended as a warning and will ask you if you still want to keep those data. If you cannot enter data that you know to be valid, please contact us and we will look into it.
The second type will normally appear in a different color on the page after you have submitted data. This could be for example because you've tried entering an invalid square number (you may also get messages that are not errors, simply to tell you that the data have been processed successfully).
Finally, other types of errors will bring up a page saying "There has been an error processing your request". As soon as you reach that page, the program will generate an email to tell us about the error so we can try to fix it immediately. That message will tell us what error has just occurred as well as provide us with information that will help us determine why that error has happened. Each error have a unique reference number that you can use if you have any question or additional details.