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Exception in thread "main" java.lang.ClassCastException

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i have a problem and i need your help
please help me
i get this exception: Exception in thread "main" java.lang.ClassCastException: java.awt.Color cannot be cast to java.lang.Comparable

and my program is :
import java.awt.Color;
import java.util.TreeMap;

public class Street extends buyable{

int[] rent = new int[5];
int rent_hotel;
Color color;
int buildCost;
int sellPrice;
static TreeMap <Color,Integer> numOfHouse = new TreeMap<Color,Integer>();
int numberOfHouse=0;
int numberOfHotel=0;

public Street(String name,int number,int mortValue,int price,int rent0,int rent1,int rent2,int rent3,int rent4,int rent_hotel,int buildCost,Color color) {
super(name, number, mortValue, price);
rent[0] = rent0;
rent[1] = rent1;
rent[2] = rent2;
rent[3] = rent3;
rent[4] = rent4;
this.rent_hotel = rent_hotel;
this.color = color;
this.buildCost = buildCost;
this.sellPrice = buildCost / 2;
numOfHouse.put(color ,new Integer(0));

public static void main(String[] args) {
Street m = new Street("mian",43,4,3,1,2,3,4,5,6,7,;
Integer a= m.numOfHouse.get(;
what should i do to solve this problem?
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