You both have one error in common:
2017-12-06 01:15:49.703: ERROR: [EXCEPTION] (scripts/client/game.py, 189):
Traceback (most recent call last):
File "scripts/client/game.py", line 157, in init
File "scripts/client/gui/shared/personality.py", line 357, in init
File "scripts/client/gui/mods/__init__.py", line 18, in init
File "scripts/client/gui/mods/__init__.py", line 66, in _findValidMODs
File "scripts/common/Lib/importlib/__init__.py", line 37, in import_module
File "mod_modpackCheck", line 190, in <module>
File "mod_modpackCheck", line 96, in checkVersion
File "scripts/common/Lib/xml/dom/minidom.py", line 1928, in parseString
File "scripts/common/Lib/xml/dom/expatbuilder.py", line 940, in parseString
File "scripts/common/Lib/xml/dom/expatbuilder.py", line 223, in parseString
ExpatError: syntax error: line 1, column 0
I cannot reproduce this, maybe the link for modpack check was not working for short time, and it was crashing the game for you. Now it seem to work fine.
Check if this url is accessible for you: https://goo.gl/9FHfE4