I am attempting to make a custom block according to the EV3 Block Developer kit (found here). I was able to create a simple block that returns the length of a string. This is what it looks like: (The above program would correctly display a value of "2" on the screen.)
However, I am running into problems when I try to use the "string subset" block in the dev kit. The following program will not even compile (the text says "GOODBYE CRUEL WORLD"):
I've hunted down the problem as residing in the "string subsection" block: Whenever this block is left out, the code will compile. Is this block not supported in EV3-G?
Edit: Here's the program along with the error: