FrequencyTable.h:11: error: ISO C++ forbids declaration of ‘vector’ with no type

#ifndef FREQUENCY_NODE_H
#define FREQUENCY_NODE_H
 
#include <iostream>
#include <stdlib.h>
#include <string>
 
class FrequencyNode {
private:
	int frequency;			//Key
	char character;		//Element
 
public:
	FrequencyNode()													//default constructor
		:character(0) {}												
	FrequencyNode(int freqParam, char charParam) 			//constructor
		:frequency(freqParam), character(charParam) {}		
 
	int getKey() { return frequency; }
	char getChar() { return character; }
 
	int incrimentKey() { frequency++; }
	int assignChar(char ch) { character = ch; }
 
};
 
#endif

#include "FrequencyNode.h"
 
#include <vector>
 
#ifndef FREQUENCY_TABLE_H
#define FREQUENCY_TABLE_H
 
class FrequencyTable {
 
private:
	vector<FrequencyNode> list;
 
public:
	int getlist() { return list; }
 
	FrequencyNode getMin();
	bool charInTable(char ch);
 
};
 
//FUNCTION DEFINITIONS
FrequencyNode FrequencyTable::getMin() {
	FrequencyNode smallest = list[0];
	for(int i = 0; i < list.size(); i++) {
		if(list[i].getKey() < smallest.getKey[i]) {
			smallest = list[i];
		}		//end if statment
	}		//end for loop
 
	return smallest;	
}
 
bool FrequencyTable::charInTable(char ch) {
 
	for(int i = 0; i < list.size(); i++) {
		if(list[i].getChar() == ch) {
			return true;
		}		//end if statment
	}		//end for loop
 
return false;
 
}
 
#endif