access violation error for push_back on a vector

[idleimp]

i have a class PCB,

vector <PCB> ready;
vector <PCB> blocked;

if(!blocked.empty())
{
class PCB testx;
testx=blocked[0];
if(testx.ioprocess==2)
{
//remove from blocked Q and put onto ready Q
init_readyQ(testx);
blocked.erase(blocked.begin());
}
}

and init_readyQ is

void OS::init_readyQ(class PCB test)
{
cout << "In init_readyQ" << endl;
VA=getchar();
test.em=0;
test.EM="";
test.si=0;
test.lines=0;
test.ioprocess=0;
test.init_swapper();
ready.push_back(test);
cout << "Out of init_readyQ" << ready.size() <<endl;
return;
};

i am calling init_readyQ from other places also. but the init_readyQ fails somtimes when i am tryign to call it from the above mentioned code. I don't understand what i am doign wrong :(

[horace1]

suggest printing out some information about vector ready and PCB test in case they are corrupt. what does function test.init_swapper(); do? could it cause the problem?

[idleimp]

vector ready is empty and PCB test is comping off another vector of the same type as ready.. init_swapper initialises some variables in PCB

suggest printing out some information about vector ready and PCB test in case they are corrupt. what does function test.init_swapper(); do? could it cause the problem?

[horace1]

vector ready is empty and PCB test is comping off another vector of the same type as ready.. init_swapper initialises some variables in PCB

I doubt if it is vector as it has been around for a long time and is well tested. What compiler / operating system are you using (have you tried a different one) ? what is the actual error? could you post all the code ?