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Port bound error.


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I'm trying to implement a FIR Filter with a series of FIR node and the data_in of every fir node is connected to the data_out of the next fir node and the last data_out is connected to the data_in of the accumulator.
I've implemented the code but during runtime it's giving an error "(E109) complete binding failed: port not bound: port 'FIR_NOD[10].port_2' (sc_out)".
I'm attaching the code with this message.
It seems to me that I have connected the ports correctly. Please help

int sc_main(int argc, char* argv[]) {
int i;
char nodeName[19];

//signals to connect data and mul ports
sc_signal data_sig[NUM_TAP + 1];
sc_signal mul_sig[NUM_TAP];
sc_signal result;

//system clock
sc_clock* sys_clock;

//pointer for modules
Memory* mem;
FirNode * firnodes[NUM_TAP];
Accumulator* accu;

// create global clock
sys_clock = new sc_clock("SYSTEM_CLOCK", 1, SC_NS);

//Construct Memory and Accumulator modules
mem = new Memory("MEMORY");
accu = new Accumulator("ACCUMULATOR");
//Construct FirNodes (assign coefficient to each node)
for (i = 0; i < NUM_TAP; i++) {
sprintf(nodeName, "FIR_NOD[%d]", i);
firnodes = new FirNode(nodeName, COEFF);

//connect ports of memory

// connect ports of fir_nodes

for(i = 0; i< NUM_TAP - 1; i++){



for(i = 0; i< NUM_TAP - 1; i++){
if(i == 10){

firnodes[i + 1]->data_out(data_sig[12]);


firnodes[NUM_TAP - 1]->mul_out(mul_sig[NUM_TAP - 1]);

// connect ports of accumulator
accu->data_in(firnodes[NUM_TAP - 1]->data_out);

for(i=0; i< NUM_TAP; i++){




//start simulation
sc_start(300, SC_NS);
return 0;
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