can`t connect

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Hi

I want connect to predefined system using this by PageProcessorComponent

// get a client service  
IJCOClientService clientService = (IJCOClientService) request.getService(IJCOClientService.KEY);
JCO.Client client = clientService.getJCOClient("VA4088", request);       
// connect to SAP system       
client.connect();

Line IJCOClientService clientService = (IJCOClientService) request.getService(IJCOClientService.KEY); throws exception

An exception occurred while processing a request for :

iView : pokus4.Landscape

Component Name : pokus4.Landscape

com/sapportals/portal/prt/service/jco/IJCOClientService.

Exception id: 10:52_26/04/05_0092_3246050

See the details for the exception ID in the log file

Please, whats wrong?