The 1571 came out at the end of 2013. Just postdates your compiler.
It was added just a couple of versions later (5.019 launched at
the start of 2014, has support for this) ...
You can download the CCS demo. It will be a current (or nearly current)
version of the compiler. It's the full compiler, except that it doesn't have
most of the example files. It will have the 12 ...