WDTypeNotFoundException: type java:com.sap.mw.jco.JCO.Client not found

Hello!

I got a problem that i need your help and suggestion.

I create a context attribute value with a type: com.sap.mw.jco.JCO.Client

then i have a code to set that attribute value with a client like below:

wdContext.currentCat2AuthorizationElement().setJcoClient(wdThis.getConnection());

Note: wdThis.getConnection() return to me a Client

but when i run the application. i got this error message: WDTypeNotFoundException: type java:com.sap.mw.jco.JCO.Client not found

Please help me because i don't know how to fix this. thank you very much for all the suggestion and help.