I'm coding 3 DC Motors to a Mega2560 Arduino (With motor sheild) and an error popped up saying DC_Motor.h:NO file or dictionary,even tho its correct? [duplicate]

Question

heres my code reduced to minimum */

#include <DC_Motor.h>
void setup() {

}

void loop() {

}

heres the error-

/tmp/982713958/Animated_snowman_M1_M2_Arduino/Animated_snowman_M1_M2_Arduino.ino:2:10: fatal error: DC_Motor.h: No such file or directory

compilation terminated.

exit status 1

What could be the reason why the library is not found?