朋友，我遇到以下非数字错误，谁可以帮助我解决此问题？

getServiceHub().getVaultService().queryBy(SampleState.class)
    .getStates().stream()
    // Filter based on field value "XYZ"
    .filter(sampleStateAndRef -> {
        SampleState sampleState = sampleStateStateAndRef.getState().getData();
                return sampleState.getField().equals("XYZ");
        }).findAny().orElseThrow(() -> new FlowException("State Not Found"));