This update handles InvocationTargetException in friendlier way. If the error was thrown because of bad input, you'll get more meaningful message like this:
CommandBlock at -105 84 -123 has thrown SyntaxException. Please check the input. (e[distance=..150,type=minecaft: player] (....150,type=<--[HERE]))
Also, if you have old CommandBlocks that use radius as 'r' instead of new 'distance', they will be (hopefully) auto fixed ( r=150 -> distance=..150)