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

Minecraft glitch - sheep walking through fences?

Okay my sheep are literally just walking through the fences now, they aren't even being pushed into it.
I'm playing Minecraft 1.7.4. Wasn't this fixed in 1.6.2?
I literally just went to my sheep barn and the red sheep walked over and went through the gate.
Please help.

This is my barn:
image

Added (1). @Coraline,
I play on my laptop. It's been happening a lot and I shut down my laptop when I go to bed.

White screen in minecraft?

Okay, so I signed into minecraft and I launch the game, however, the game doesn't come up. After the Mojang screen, my minecraft just randomly turns white. My minecraft version is completely un-modded and I have not modified the.jar or the.json file in any kind of way. I tried re installing java, re installing java jdk, and I have even updated my graphics card and allocate more ram to minecraft but none of those worked.

Is this setup good to run mineraft over 100 fps?

I know a lot about computers but don't know how good this setup would run minecraft.

Specs:
Processor1 x Intel® Core™ i7 4960X Processor (6x 3.60GHz/15MB L3 Cache)-Intel Core i7 4960X w/ Intel Performance Tuning Protection

Processor Cooling1 x Liquid CPU Cooling System [Intel]-Standard 120mm Fan
Memory1 x 32 GB [8 GB x4] DDR3-1600 Memory Module-FREE Upgrade to DDR3-1866 ADATA XPG V2

Video Card1 x NVIDIA GeForce GTX 780 - 3GB-Single Card

Motherboard1 x Gigabyte GA-X79-UP4 -- 4x PCI-E 2.0 x16-

Power Supply1 x 600 Watt - Standard-Free Upgrade to 600W OCZ ModXStream Pro - 80 PLUS

Primary Hard Drive1 x 120 GB Samsung 840 EVO SSD -- Read: 540MB/s, Write: 410MB/s-Dual 120GB Drives (240GB Capacity) - RAID 0 High Performance

Data Hard Drive1 x 2 TB HARD DRIVE -- 64M Cache, 7200rpm, 6.0Gb/s-Single Drive

Optical Drive1 x [12x Blu-Ray] LG BLU-RAY Reader, DVD±R/±RW Burner Combo Drive-FREE upgrade to BLU-RAY Rewriter

Operating System1 x Windows 8.1

I'm also wondering if this will be able to play other games such as Call of Duty and Just Cause 2?
Thank you!

Added (1). ALSO
will i be able to record minecraft, CoD and Just Cause 2 with DxTory?

Looking for a Minecraft Partner or team?

I've got bored of playing Minecraft by myself and i want to play with someone. I would love to make videos with them too but its not really necessary i just want someone to play with. Oh by the way you have to fill this in.

Age: (13-15) i get awkward when i talk to older people of my age
Skype: (so we can talk in private or something)
IGN: (so i know your Mincraft Name)

Is Minecraft good for kids?

I've been playing the demo of minecraft and my little bro saw me playing it and thought it looked fun so i let him play it. He enjoyed but it was only a demo so should i buy minecraft for him?