Can't get the adc0831 blocks to work in BlocklyProp

When I compile the attached (1st png file) BlocklyProp graphical code, I get the attached (2nd png file) message from the compiler. The PropC code generated indicates the BlocklyProp cannot find the "read_adc083x" function in the simpletons library. Both the code "A/D set Vref ..." and "A/D chip read ..." blocks are in the BlocklyProp block system.

How do I use the "A/D chip read" to read the "ADC0831" chip I have on my board.

Thanks, Clark