PCA9557 not compiling on Arduino 2.3.1

Tutorial Lesson 2 and any .ino which includes PCA9557.h does not compile in Arduino 2.3.1.
I have copied PCA9557.h into the tutorial directory.
Several error messages primarily:
error: reference to 'PCA9557' is ambiguous
error: 'Out' was not declared in this scope
32 | Out.reset();
Any guidance appreciated


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