Your setup has a bad line

[JSybrandt]

starting @ line 146 change to:
echo "Uncompressing Google Closure Compiler..."
unzip $LIBRARY/compiler-latest.zip closure-compiler-v20170423.jar -d $LIBRARY
 mv $LIBRARY/closure-compiler-v20170423.jar $LIBRARY/closure-compiler.jar

Note that the name of the jar file has changed