Exception Summary Exception Description EnvelopeAccessDeniedExceptionThis exception is thrown if an artifact cannot be opened. EnvelopeAlreadyExistsExceptionThis exception is thrown if an envelope already exists in the networks DHT. EnvelopeExceptionThis general exception or its more specific subclasses are thrown, if an error in relation with the shared storage system occurs. EnvelopeNotFoundExceptionThis exception is thrown if an artifact was not found in the networks DHT. EnvelopeOperationFailedExceptionThis exception is thrown if an storage operation fails. MergeFailedExceptionIndicates that merging envelopes failed.