How to run Nodus 1.7.2 on Mac?

I can't run Nodus 1.7.2 on my MacBook Air. It closes the start menu then it quickly reappears. Here is the error message: /lukas/Library/Application Support/minecraft/versions/Nodus1.7.2MCP… N.A1.B8.Nodus_aBbebBfFbEbbBffA
[21:06:56 INFO]: Client> Exception in thread "main" java.lang.UnsupportedClassVersionError: N/A1/B8/Nodus_aBbebBfFbEbbBffA: Unsupported major.minor version 51.0
[21:06:56 INFO]: Client> at java.lang.ClassLoader.defineClass1(Nativ… Method)
[21:06:56 INFO]: Client> at java.lang.ClassLoader.defineClassCond(Cl…
[21:06:56 INFO]: Client> at java.lang.ClassLoader.defineClass(ClassL…
[21:06:56 INFO]: Client> at java.security.SecureClassLoader.defineCl…
[21:06:56 INFO]: Client> at java.net.URLClassLoader.defineClass(URLC…
[21:06:56 INFO]: Client> at java.net.URLClassLoader.access$000(URLCl…
[21:06:56 INFO]: Client> at java.net.URLClassLoader$1.run(URLClassLo…
[21:06:56 INFO]: Client> at java.security.AccessController.doPrivile… Method)
[21:06:56 INFO]: Client> at java.net.URLClassLoader.findClass(URLCla…
[21:06:56 INFO]: Client> at java.lang.ClassLoader.loadClass(ClassLoa…
[21:06:56 INFO]: Client> at sun.misc.Launcher$AppClassLoader.loadCla…
[21:06:56 INFO]: Client> at java.lang.ClassLoader.loadClass(ClassLoa…
[21:06:56 ERROR]: Game ended with bad state (exit code 1)
[21:06:56 INFO]: Deleting /Users/lukas/Library/Application Support/minecraft/versions/Nodus1.7.2MCP…
[21:06:56 INFO]: Ignoring visibility rule and showing launcher due to a game crash