How to solve Invocation error: ALC-DSC-003-000.

Hi,

I upgraded the "Reader Extensions 7.2" Using "ReaderExtensions ES" for watch folder concept. It worked well for so many days but now it throws the below mentioned errorlog. How could i rectify the following error. Please advice.

Failure Time----Fri Jul 04 16:42:10 IST 2008
source location ---- Reason of failure is-----Invocation error.
Invocation error.
ALC-RES-001-015: The requested usage right, [CommentsOnline], is not allowed by the credential, [SampleReaderExtensionsCredential].
ALC-DSC-003-000: com.adobe.idp.dsc.DSCInvocationException: Invocation error.
at com.adobe.idp.dsc.component.impl.DefaultPOJOInvokerImpl.invoke(DefaultPOJOInvokerImpl.jav a:152)

Regards,
Prabudass