Cannot install Stanford Parser

gistfile1.txt

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
        at edu.stanford.nlp.parser.common.ParserGrammar.<clinit>(ParserGrammar.java:46)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 1 more

Traceback (most recent call last):
  File "test.py", line 11, in <module>
    sentences = parser.raw_parse_sents(("Hello, My name is Melroy.", "What is your name?"))
  File "/Library/Python/2.7/site-packages/nltk/parse/stanford.py", line 153, in raw_parse_sents
    return self._parse_trees_output(self._execute(cmd, '\n'.join(sentences), verbose))
  File "/Library/Python/2.7/site-packages/nltk/parse/stanford.py", line 219, in _execute
    stdout=PIPE, stderr=PIPE)
  File "/Library/Python/2.7/site-packages/nltk/internals.py", line 136, in java
    raise OSError('Java command failed : ' + str(cmd))