Upgrading CI generates error

[eluser]Dam1an[/eluser]
[quote author="Computerzworld" date="1243447092"]@TheFuzzy0ne

So.. the code written in older version doesn't works with newer one? That should not be the case... Because just upgrading system files should not effect my existing code.[/quote]

In most cases, old code should work fine with newer versions
But in order to add some new functionality, they may have to make some major changes to any interfacing (public) methods, although I'm sure they weigh the pro's and con's of doing so, and document them

Also, a lot of code that breaks when upgrading is when the developer 'misused' the system, such as directly accessing private variables and methods, which EL can change as and when they want, as only their internal parts should use these