error: 'microsecondsToClockCycles' was not declared in this scope #214

Hello guys,

I'm using an ASP-Corvette-T1 connected to a DHT2 and I'm getting this error.

Can you tell me where I can find the documentation for "microsecondsToClockCycles"? Can't find it on the Internet

The IDE I use is Arduino 2.3.2