Error importing certificate and key through icontrol api

I have the key file and certificate file on my laptop. i am trying to import it on to f5 loadbalancer through icontrol api. Getting the following error. Any help would be very much appreciated.

AxisFault faultCode: {http://schemas.xmlsoap.org/soap/envelope/}Server faultSubcode: faultString: Exception caught in Management::urn:iControl:Management/KeyCertificate::key_import_from_file() Exception: Common::OperationFailed primary_error_code : -2 (0xFFFFFFFE) secondary_error_code : 0 error_string : Not Found faultActor: faultNode: faultDetail: {http://xml.apache.org/axis/}stackTrace:Exception caught in Management::urn:iControl:Management/KeyCertificate::key_import_from_file() Exception: Common::OperationFailed