B4R Question Why I can't compile the example b4r program?

[Theera]

https://uppic.cc/d/87s
I test scrolling text LED Maxtrix7219 with nodeMCU v.3
I've installed nodeMCU v.3 already,and select board LOlin(Wemos )D1 R2&mini

 

[Erel]

Better to copy the text and paste it.

There is no byteconverter library in B4R. ByteConverter is included in rRandomAccessFile library.