MCreator won't let me choose red sand

mcreator won't let me choose red sand for the top block in a custom biome, it defaults to only yellow sand and i can't change it in code either... 

the same thing happens with blocks with more than one type such as logs, wool, carpet etc.

gradle log
 

C:\Pylo\MCreator178\forge\build\sources\main\java\mod\mcreator\mcreator_badlands.java:70: error: cannot find symbol
            topBlock = Blocks.RED_SAND.getDefaultState();
                             ^
  symbol:   variable RED_SAND
  location: class Blocks
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.