It was rounding 32 down to 24, 24 down to 16, and claiming 16 was invalid.
See doc/crypt.pdf
					Languages
				
				
								
								
									C
								
								98.2%
							
						
							
								
								
									Makefile
								
								0.7%
							
						
							
								
								
									Perl
								
								0.4%
							
						
							
								
								
									Shell
								
								0.3%
							
						
							
								
								
									Java
								
								0.2%
							
						
							
								
								
									Other
								
								0.1%