Mac Launcher Not Opening - MAC

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dragonmaster6242

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Jul 29, 2019
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I ve been having this problem when ever I open up the .jar launcher for mac, It says:

The Java JAR file “FTB_Launcher.jar” could not be launched.
Check Console for posable error messages.

I checked the console and it says this:
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] Exception in thread "main"
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] java.lang.UnsupportedClassVersionError: Bad version number in .class file
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.lang.ClassLoader.defineClass1(Native Method)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.security.AccessController.doPrivileged(Native Method)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
3/03/13 1:19:13 PM [0x0-0x1c01c].com.apple.JarLauncher[143] at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x10012fa50, p = 0x10012fa54, pEnd = 0x10012fa58)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] SystemFlippers: didn't consume all data for long ID 0 (pBase = 0x100131b80, p = 0x100131b84, pEnd = 0x100131b88)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] Exception in thread "main"
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] java.lang.UnsupportedClassVersionError: Bad version number in .class file
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] at java.lang.ClassLoader.defineClass1(Native Method)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
3/03/13 1:26:49 PM [0x0-0x22022].com.apple.JarLauncher[166] at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
Please help, I have been having this problem with Tekkit too.
BTW I use a MacBook (the older ones)

Thanks
 
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