Won't install any modpacks.

[icninja]

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]

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.

techniclauncher_2016-12-19.txt

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)

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

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

Please help :(