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Attempt to de-reference a null object

Please help me with this error.

When I try to load my Visualforce page this comes up...


Attempt to de-reference a null object 


An unexpected error has occurred. Your development organization has been notified.



We'll need a bit more information than this I'm afraid.  It  is likely to mean that you have a variable/property/sobject reference/field that is null, but you are assuming that it isn't and executing a method on it. 


We'll need to see the code - do you have any more information regarding where the error occurs (e.g. line number)?