I found this error by trying to use this code as Gate in AR
!LogFreq hasChangedInLast: 0.3 s
It shows LogFreq nn send to hasChangedInLast class was not understood. I was assuming because !LogFreq is a keyword that is assigned to another class therefore I used another word for that hot value, it worked.
However, I also found out the same problem happens in BinauralEarlyReflections + Reverb prototype. I am guessing there will be more sounds or prototypes might contain the same issue.