Cannot find symbol of method even though its public

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Java

I have a few methods defined in 1 .java file, while the main is in another file, one of these methods is this one:

public void saveParking (String fileName)throws FileNotFoundException { //ESTATICO?
   File fichero = new File(fileName);
   int numMaxZone = 0;
   int temp = 0;
   int temp_int = 0;
   int numero = 0;

   if (fichero.exists() == true) {
       PrintWriter pw = new PrintWriter(fichero);
       temp = (int)maxZone;
       temp_int = 64;
       numMaxZone = temp - temp_int;
       numero = sizeZone + 1;
       pw.println(numMaxZone + numero); //ESCRIBO EN EL FICHERO LAS DIMENSIONES
       for (int i=0; i<numMaxZone; i++) {
       for (int j=0; j<numero; j++) {
           pw.println(carSpaces[i][j].toText());
       }
       }
   }else{
       PrintWriter pw2 = new PrintWriter(fichero);
       temp = (int)maxZone;
       temp_int = 64;
       numMaxZone = temp - temp_int;
       numero = sizeZone + 1;
       pw2.println(numMaxZone + numero); //ESCRIBO EN EL FICHERO LAS DIMENSIONES
       for (int i=0; i<numMaxZone; i++) {
       for (int j=0; j<numero; j++) {
           pw2.println(carSpaces[i][j].toText());
       }
       }

   }
   }

which I then invoke from the main

new P3b().saveParking(args[2]);

Which gives me the "cannot find symbol" error

What I have tried:

I have another method, which is a constructor set as public, and this one doesn't give me this error when I invoke it in the main

I've also checked that each parenthesis before the start of the next method matches with the first parenthesis after the method signature