a few people have been getting the runtime error 2001 'you cancelled the previous operation' and after many a search I found the reason behind the extremely vague error message...
The answer is here...
This message is far from helpful, as it bears no obvious relation to the problem!
It can occur in VBA when Access cannot make sense of part of an embedded SQL statement, or when elements within a Domain Aggregate Function are incorrectly specified.
Look at the Staff Holiday Booking example database. The Holiday form uses a DSum statement to add up the total holiday days booked:
Forms![Staff]!txtSumOfDays = DSum("days", "qryHolDates", "[staffId] = " & Me!staffId)
If you change the "days" to "day" for the first parameter to the DSum statement then you will duly get the error message, as there is no field called "day" on qryHolDates.
The solution is to look carefully at each element of the SQL or Function, and check that they are entirely correct. Put all SQL in string variables, then you can check the contents at run (i.e. failure) time in the Debugger. It could also be useful to put the 3rd parameter (the SQL criterion) for a Domain Aggregate Function in a variable for checking at run/failure time.
Tip. it can be useful to try the function without the optional 3rd parameter (the SQL criterion). If it does not fail, then the fault is in the criterion, so check that carefully. If it still fails, then the fault lies with one (or both!) of the first two parameters.
See the end of section 6.6 of the 'Getting Started' VBA Trainer for a list of things that cause errors in embedded SQL - many of these also apply to Domain Aggregate Function code.
You may also get this error message when you hit OK on an unexpected parameter box, without actually entering a value. The parameter boxes (as you should know) pop up when Access cannot find the item specified - the usual cause is a misspelled name, or an incorrect name for a form or field.
Basically check your spelling and also check your SQL statements are correct taking into consideration the data types of the fields the SQL statement include.
I hope this 'elps.