[TYPO3-english] ViewHelper from another extension / extending ViewHelper (Typo3 6.2.4)

[Dipankar Das]

Hi,

I am new to ViewHelp thing and I am stuck for few days now with this. 
Please help.

I want to add a new viewhelper to an existing extension (SbPortfolio2). 
So I created a new extension and added a new viewhelper to the new 
extension.

Then called this new viewhelper in the template of the existing 
extension (SbPortfolio2). I have added the namespace to my new extension 
as well.

Modified SbPortfolio2 extension template file:
---------------

{namespace sbp2=Tx_SbPortfolio2_ViewHelpers}}
{namespace fivee=Tx_FiveePortfoliofilter_ViewHelpers}
..
...
<p class="{fivee:category(categories: item.categories)}">test</p>





I get Error
-------------
Could not analyse 
class:Tx_FiveePortfoliofilter_ViewHelpers_CategoryViewHelper maybe not 
loaded or no autoloader?

I am using Typo3 6.2.4

Can anyone point me where to look for the problem.
Is there a way to debug/trace the problem.

thanks
Dipankar Das
--
FiveE Technologies
http://fiveetech.com