Tbh, your forum confuses me in the form of links and just stuff. Why dont you guys have spoilers?
Anyway
Modpack - http://www.technicpack.net/api/modpack/heavyfallsmp-server
So, far it's only the custom pack that doesn't load properly or has something wrong with it.
Finally, This is from the Terminal.
Last login: Sun Jul 27 19:40:59 on console /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java ; exit; cexs-imac:~ cex$ /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java ; exit; Usage: java [-options] class [args...] (to execute a class) or java [-options] -jar jarfile [args...] (to execute a jar file) where options include: -d32 use a 32-bit data model if available -d64 use a 64-bit data model if available (implies -server, only for x86_64) -client to select the "client" VM -server to select the "server" VM -jvm is a synonym for the "client" VM [deprecated] -hotspot is a synonym for the "client" VM [deprecated] The default VM is client. -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> A : separated list of directories, JAR archives, and ZIP archives to search for class files. -D<name>=<value> set a system property -verbose[:class|gc|jni] enable verbose output -version print product version and exit -version:<value> require the specified version to run -showversion print product version and continue -jre-restrict-search | -jre-no-restrict-search include/exclude user private JREs in the version search -? -help print this help message -X print help on non-standard options -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system assertions -agentlib:<libname>[=<options>] load native agent library <libname>, e.g. -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help -agentpath:<pathname>[=<options>] load native agent library by full pathname -javaagent:<jarpath>[=<options>] load Java programming language agent, see java.lang.instrument -splash:<imagepath> show splash screen with specified image logout [Process completed]