Hi , 


This is a standard error, 

This usually means that the data in the form is exceeding the limit which is generally high as the limit for values is 135kb. 

See the links below for more information and best practices for resolving this error. 

1. Remove  unnecessary data members from the controller class and try to suffice them by using local variables. Consider using transient variables etc. In your code I see fileBody as a Blob variable as a data member but only used in one function. Cant this made a local variable?

2. If you are using collection variables such as Lists, sets and Maps as data members. Let these type of variables be loaded with data required at that point of time in page's execution. Clear/nullify these collection variables when they can be.

3. Try not to use too many pageBlocks. Try loading the components of the Page dynamically rather than loading all of them at once. etc.

4. Basically you need to optimize your Logic so that the data transfered between postbacks is only as much as required.

These points have helped me several times to resolve the error... Hope this helps...


http://forceguru.blogspot.in/2010/11/best-practise-to-write-apex.html

http://www.eltoro.it/ArticleViewer?id=a07A000000NPRhPIAX

http://learningthecloudway.blogspot.in/2013/02/how-to-deal-with-error-maximum-view.html


Regards,
Ashish