fatal error: SoftwareSerial.h: No such file or directory

[akama-aka]

Hello I've the following Code:

#include <SoftwareSerial.hpp>
#include <Sim800L.h>
#define RX 15
#define TX 14
Sim800L GSM(RX, TX);

void setup(){
Serial.begin(9600);
GSM.begin(9600);
Serial.println("GET PRODUCT INFO: ");
Serial.println(GSM.getProductInfo());
}
void loop(){
}

but I get everytime this error:

In file included from /tmp/sketch_jan10a/sketch_jan10a.ino:1:0:
/home/slush/Arduino/libraries/Sim800L_Library_Revised/Sim800L.h:62:10: fatal error: SoftwareSerial.h: No such file or directory
 #include <SoftwareSerial.h>
          ^~~~~~~~~~~~~~~~~~
compilation terminated.
Multiple libraries were found for "Sim800L.h"
 Used: /home/slush/Arduino/libraries/Sim800L_Library_Revised
 Not used: /home/slush/Arduino/libraries/Sim800L-Arduino-Library-revised-1.1.9
exit status 1
Error compiling for board Raspberry Pi Pico.

Someone know how I can fix that