rscalc error

[s0161038]

Dear all,

I just reflashed my SD card after becoming read-only (LM4). After the recovery, I updated to firmware 20200720.

After restoring my backup I noticed the common rscalc function I use to check if the sun is up is not working any more on my system. 

Code:

function sun_is_up()   -- returns number of minutes from 0:00 until sunrise and sunset   latitude = 57   longitude = 24.15   log('gerund')   sunrise, sunset = rscalc(latitude, longitude)     date = os.date('*t')     now = date.hour * 60 + date.min     -- from 0:00 to sunrise         if now < sunrise then           alert('before sunrise')     return false     -- from sunset to 23:59         elseif now > sunset then           alert('after sunset')     return false         else           alert('day')     return true         end end

I always get the following error:


Common functions:7: attempt to call global 'rscalc' (a nil value)
stack traceback:

Does anybody have an idea what this is causing? 
Or does anybody know where the sourcecode of rscalc can be found to check what is going wrong?

thanks