Suddenly my computer says that it can't compile my code

Development Tools IDE 1.x
1

Here is my code:
#include "MeMCore.h"
#include "Wire.h"
#include "Adafruit_LiquidCrystal.h"
Adafruit_LiquidCrystal lcd(0);
char line[13] = "Ana has apples.";

String line;
void setup() {
lcd.begin(16, 2);
lcd.setCursor (0, 6);
lcd.print("Hello,say a name");
delay(2000);
lcd.clear();

}

void loop() {
line =Serial.readString();
if(Serial.available()){
line.trim();
lcd.clear();
lcd.println("Hello");
lcd.print(linegotten);

}
lcd.setBacklight(HIGH);
delay(500);
}

Here is the error code:

Arduino: 1.8.5 (Windows Store 1.8.10.0) (Windows 10), Board: "Arduino/Genuino Uno"

C:\Users\cooki_dh1ol9a\Desktop\Bogdan - KEEP OUT!\my_program_1\my_program_1.ino:1:22: fatal error: MeMCore.h: No such file or directory

#include "MeMCore.h"

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

If you have any idea why it doesn't work, please tell me. Thank you.

my_program_1.ino (491 Bytes)

2

What changes did you make since the last time it did compile successfully?

Where is the file MeMCore.h located? The compiler can't find it.

3

Perhaps install the library again? That it then can find the path?

4

I think you should upload the code to a another board

5

As adwsystems and 110248 said ... Where is your library ?

It is falling over on the fact that it cannot find it.

There is no need to upload to a different board !