View Compilation Error

0_0_6140018_3173\Main.java:6: cannot find symbol
symbol  : class Dia
location: class Main
	public static Dia [][]map;
	              ^
0_0_6140018_3173\Main.java:8: cannot find symbol
symbol  : class Dia
location: class Main
	public static Dia []dia = new Dia[12];
	              ^
0_0_6140018_3173\Main.java:8: cannot find symbol
symbol  : class Dia
location: class Main
	public static Dia []dia = new Dia[12];
	                              ^
0_0_6140018_3173\Main.java:20: cannot find symbol
symbol  : class Dia
location: class Main
			map = new Dia[N][M];
			          ^
0_0_6140018_3173\Main.java:53: cannot find symbol
symbol  : class Dia
location: class Main
					Dia temp = map[i][j];
					^
0_0_6140018_3173\Main.java:67: cannot find symbol
symbol  : class Dia
location: class Main
		Dia temp = map[i][j];
		^
0_0_6140018_3173\Main.java:82: cannot find symbol
symbol  : class Dia
location: class Main
			dia[i] = new Dia();
			             ^
7 errors