[My technic is not istalling mods]

Hi i need help with my technic launcher.

My technic is not istalling mods and in the console show this codes:

[B#608] java.lang.NoClassDefFoundError: org/eclipse/aether/impl/DefaultServiceLocator$ErrorHandler
[B#608]     at net.technicpack.minecraftcore.install.tasks.HandleVersionFileTask.<init>(HandleVersionFileTask.java:60)
[B#608]     at net.technicpack.launcher.launch.Installer.buildTasksQueue(Installer.java:282)
[B#608]     at net.technicpack.launcher.launch.Installer$1.run(Installer.java:114)
[B#608]     at java.lang.Thread.run(Unknown Source)
[B#608] Caused by: java.lang.ClassNotFoundException: org.eclipse.aether.impl.DefaultServiceLocator$ErrorHandler
[B#608]     at java.net.URLClassLoader.findClass(Unknown Source)
[B#608]     at com.regexlab.j2e.Jar2ExeClassLoader.findClass(Unknown Source)
[B#608]     at java.lang.ClassLoader.loadClass(Unknown Source)
[B#608]     at java.lang.ClassLoader.loadClass(Unknown Source)
[B#608]     ... 4 more
[B#608] Unhandled Exception in Thread[Thread-695,6,main]