Weird <vector> Error

[waverdr9]

I am currently working on a program and I have come across an error that I am unsure about how to fix. Here is the section of code that it occurs in:

 1: Customer* Store::remove(int num) {
 2: 	vector<Customer *>::iterator pos; //Vector iterator
 3:
 4: 	//Set the iterator to the first customer in the line
 5: 	pos = line[num].begin();
 6:
 7: 	//Get the first customer in the line, then erase it from
 8: 	// the vector
 9: 	Customer *c = line[num].at(pos);
10: 	line[num].erase(pos);
11:
12: 	//If the line is not empty
13: 	if (!line[num].empty()) {
14: 		//Make sure the iterator is set to the first position
15: 		pos = line[num].begin();
16: 
17: 		//Service the next customer in this line
18: 		serviceCust(num, line[num].at(pos));
19: 	}
20: 	return c;
21: }

The errors occur on the following lines...
Line 9: error C2664: 'class Customer *const &__thiscall std::vector<class Customer *,class std::allocator<class Customer *> >::at(unsigned int) const
' : cannot convert parameter 1 from 'class Customer ** ' to 'unsigned int'

Line 18: error C2664: 'class Customer *const &__thiscall std::vector<class Customer *,class std::allocator<class Customer *> >::at(unsigned int) const
' : cannot convert parameter 1 from 'class Customer ** ' to 'unsigned int'

Notes:

line[ ] is declared as: vector<Customer*> line[2];
It is the array of line queues for the store.

serviceCust is a function that basically calculates the customers' departure times and schedules them. The prototype is: void serviceCust(int num, Customer *c);

Do you know why I am getting these errors, and how I can fix them?

The details of the code are probably irrelevant to the problem I am having, but if you need any more information regarding my program, please let me know.
Thank you in advance for any help you can provide me.

[AvDav]

since 'at' takes the unisgned int, you cannot provide iterator as param for it, and iterator is 'Customer **' in this case, try:

Customer *c = line[num].at(0);
//or
Customer *c = line[num][0];