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kirankumarreddy punurukirankumarreddy punuru 

null pointer exception on execution of after update

can some one tell me about this exception and  where to add null check:
my errors are:classname.methodname1: line 78,column 1
                    classname.methodname2: line 78,column 1 
                    classname.methodname3: line 78,column 1
                    Trigger:TriggerNAme:line no,column no

where i need to add null check in the class methods or in trigger.
if you are access any list or object with out inilizing it can give null pointer 

best will be you ost the calss and tell which line number is giveing error so we can find the root cause