Technic Launcher Wont Download Modpacks

So, i want to install a modpack, but my launcher wont install anything. It thinks about it for a few seconds, then cancels the download. The console reads:

[B#349] java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;[Ljava/lang/Object;Ljava/lang/Throwable;)V
[B#349] at org.eclipse.aether.internal.impl.slf4j.Slf4jLoggerFactory$Slf4jLoggerEx.debug(Slf4jLoggerFactory.java:167)
[B#349] at org.eclipse.aether.internal.impl.DefaultLocalRepositoryProvider.newLocalRepositoryManager(DefaultLocalRepositoryProvider.java:116)
[B#349] at org.eclipse.aether.internal.impl.DefaultRepositorySystem.newLocalRepositoryManager(DefaultRepositorySystem.java:421)
[B#349] at net.technicpack.utilslib.maven.MavenConnector.(MavenConnector.java:67)
[B#349] at net.technicpack.minecraftcore.install.tasks.HandleVersionFileTask.(HandleVersionFileTask.java:55)
[B#349] at net.technicpack.launcher.launch.Installer.buildTasksQueue(Installer.java:330)
[B#349] at net.technicpack.launcher.launch.Installer$1.run(Installer.java:122)
[B#349] at java.lang.Thread.run(Thread.java:745)
[B#349] Unhandled Exception in Thread[Thread-68,6,main]

For some reason the technic launcher is not allowing me to download any modpacks. I have tried all modpacks and all that appears is a 0% in the loading bar which quickly disappears. I have tried restarting the launcher, resetting the modpacks, restarting my computer and nothing seems to work. Has anyone else had this issue previously? Hello i saw the new version of Technic Launcher and it was a little. So i found it out and i wanted to show you.

B#349] Starting download of http://cdn.technicpack.net/platform2/pack-icons/856833.png?1473562256, with 3 tries remaining

B#349] Attempting to open /Users/chris18/Library/Application Support/technic/logs
[B#349] Using file:/Users/chris18/Library/Application%20Support/technic/logs/
[B#349] Intermediary path file:///Users/chris18/Library/Application%20Support/technic/logs/

If this isn't enough info to determine the issue, im using a Mac OSX 10.10.5, 2.7 GHz Intel i5 processor, 8 Gb ram, and an Intel Iris graphics card.
Here is the launcher log from my most recent attempt.

From the looks of it, it looks like the launcher isn't getting enough Java allocation, but even when altering that with a command, the issue persists.

The command was:

java -Xms(initial size)m -Xmx(Maximum size)m -jar (directory of jar file)

Technic launcher modpacks not working

Technic Launcher Modpacks Won't Play

After running this command with the following values(Xms512m, Xmx8192m), the launcher opened, with the following command lines after the original command:

Settings for exe: /Users/chris18/Downloads/TechnicLauncher.jar
Portable settings dir: /Users/chris18/Downloads/technic
Setting up logging

Technic Launcher Wont Load Any Modpacks

after this, with the opened launcher, i tried to download a pack, and nothing was solved.

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Technic Launcher Modpacks Not Working

Please help :(