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Can you confirm that your computer only has 2 GB of RAM total? If this is the case, then it's very likely you won't be able to play any of the 1.6.4 packs other than FTB Lite 2, which was designed for lower end systems.
[SEVERE] [ForgeModLoader] Caught exception from Morph
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated array at line 185 column 8
I would agree with Tristam if you only have 2GB, but if you have more than that read on. This error has come up recently. The only know solution at the moment seems to be to disable morph.