Can't get the constructor to work for some reason?

[Meehdrescher]

The constructor is:

var sg = new SpectrogramGenerator(sampleRate, fftSize: 2048, stepSize: 512, maxFreq: sampleRate / 2);

Should be the correct amount, type and order of arguments for the constructor since I copied it from the readme, however I am greeted with the following error message:

SpectrogramGeneratorScript.cs(29,36): error CS1503: Argument 2: cannot convert from 'int' to 'bool'

How do I resolve this? Is it a skill issue on my end or a problem with the library?