Arduino mega programing error

Look at the errors that you get; scroll through the output window

C:\Users\sterretje\AppData\Local\Temp\arduino_modified_sketch_763798\sketch_oct16a.ino: In function 'void loop()':

sketch_oct16a:102: error: 'brake' was not declared in this scope

       brake();

       ^~~~~

sketch_oct16a:105: error: 'pumpstart' was not declared in this scope

       pumpstart();

       ^~~~~~~~~

C:\Users\sterretje\AppData\Local\Temp\arduino_modified_sketch_763798\sketch_oct16a.ino:105:7: note: suggested alternative: 'va_start'

       pumpstart();

       ^~~~~~~~~

       va_start

sketch_oct16a:106: error: 'aim' was not declared in this scope

       aim();

       ^~~

sketch_oct16a:108: error: 'pumpstop' was not declared in this scope

       pumpstop();

       ^~~~~~~~

C:\Users\sterretje\AppData\Local\Temp\arduino_modified_sketch_763798\sketch_oct16a.ino:108:7: note: suggested alternative: 'pump'

       pumpstop();

       ^~~~~~~~

       pump

sketch_oct16a:112: error: 'leftUltra' was not declared in this scope

         leftUltra();

         ^~~~~~~~~

sketch_oct16a:116: error: 'rightUltra' was not declared in this scope

         rightUltra();

         ^~~~~~~~~~

sketch_oct16a:120: error: 'forward' was not declared in this scope

         forward();

         ^~~~~~~

C:\Users\sterretje\AppData\Local\Temp\arduino_modified_sketch_763798\sketch_oct16a.ino:120:9: note: suggested alternative: 'fread'

         forward();

         ^~~~~~~

         fread

sketch_oct16a:128: error: 'brake' was not declared in this scope

     brake();

     ^~~~~

sketch_oct16a:129: error: 'right' was not declared in this scope

     right();

     ^~~~~

C:\Users\sterretje\AppData\Local\Temp\arduino_modified_sketch_763798\sketch_oct16a.ino:129:5: note: suggested alternative: 'Fdright'

     right();

     ^~~~~

     Fdright

Using library Servo at version 1.1.2 in folder: C:\Program Files (x86)\Arduino\libraries\Servo 
exit status 1
'brake' was not declared in this scope