My skin and cape aren't changing and multiplayer doesn't work

[mrlost]

Link to the launcher console log (if you have access to the “Save log” button):

Crystal Launcher LogViewer.js

Problem description:

I can’t join multiplayer and I have no skin or cape.

Other attachments (screenshots, logs, etc.):

[mrlost]

And when I have the blazepack, it crashes the game for me.