Errors Installing External Libraries (MegaServo, ServoTimer2 , SoftwareServo)

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Hello....I am using an arduino uno with a adafruit wav shield. I got a conflict with the serv.ccp and waveHC.ccp over using Timer1. I am trying to work around by using ServoTimer2 but with the simplest sketch I get these errors:

sketch_may14b.cpp.o: In function __static_initialization_and_destruction_0': C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:7: undefined reference to ServoTimer2::ServoTimer2()'
C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:8: undefined reference to ServoTimer2::ServoTimer2()' sketch_may14b.cpp.o: In function loop':
C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:19: undefined reference to ServoTimer2::write(int)' C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:21: undefined reference to ServoTimer2::write(int)'
C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:24: undefined reference to ServoTimer2::write(int)' C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:26: undefined reference to ServoTimer2::write(int)'
sketch_may14b.cpp.o: In function setup': C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:12: undefined reference to ServoTimer2::attach(int)'
C:\Users\cappy\AppData\Local\Temp\build987738042993949936.tmp/sketch_may14b.cpp:13: undefined reference to `ServoTimer2::attach(int)'

The code is as follows:

#include <ServoTimer2.h>  // the servo library

ServoTimer2 a;
ServoTimer2 b;

void setup()
{
   a.attach(5);
   b.attach(6);
}

void loop()
{
  a.write(2000);
  delay(500);
  a.write(1000);
  delay(500);
  
  b.write(2000);
  delay(5000);
  b.write(1000);
  delay(500);
}

I have found several versions of ServoTimer2 here and at the Adafruit forum. None of them are working for me. Please advise!

Thank you!!

Cappy Jack