I have created two streams on my nats-server, using nats cli. Then using nats-io/nats.c library, I created two consumers for each of the streams. now I am trying to subscribe to the topics in each of the stream, I am able to successfully subscribe to only first topic but unable to subscribe to second one, as its providing me the error: consumer is already bound to a subscription. for first topic subscription option I am using consumer1 and for second topic I am using consumer2.
Things I did

    natsStatus status;
    jsSubOptions jsSuOpts;           
    status = jsSubOptions_Init(&jsSuOpts);    
   if (streamName == "stream1")
    {
        status = CreateandUpdateConsumer("Consumer1", streamName, topicname);
        jsSuOpts.Stream = streamName.c_str();
        jsSuOpts.Consumer = "filemodule";        
        if (status == NATS_OK)
        {
            // this calls the js_Subscribe()
            subscribe_internal(topicname, &jsSuOpts, subcloud);
            

            /*can put consumer configuration if required*/
        }
    }
    else if (streamName == "stream2")
    {
        status = CreateandUpdateConsumer("Consumer2", streamName, topicname);
        jsSuOpts.Stream = streamName.c_str();
        jsSuOpts.Consumer = "filemodule_apps";
        // temp = subslbapps;
        if (status == NATS_OK)
        {

            subscribe_internal(topicname, &jsSuOpts, subslbapps);

            /*can put consumer configuration if required*/
        }
    }

Parameters that i kept global/common are :

natsConnection *conn;
    natsStatistics *stats;
    natsOptions *opts;
    natsSubscription *subcloud;
    natsSubscription *subslbapps;
    natsMsg *msg;
    jsCtx *js;
    jsOptions jsOpts;   
    jsPubOptions jsPubOpts;

So wanted to know what i am missing here ?. i am new to nats so need help.
and one strange thing if i am sending data to my topic on which, i am getting error , it receives the data (call back is invoked).