I'm having problems with this Trailhead:
https://developer.salesforce.com/trailhead/mobile_sdk_native_ios/mobilesdk_ios_getting_started

I have followed the instructions for running "forceios create" and opened the project in XCode. When I run/build the project I get this error:

ld: library not found for -lCocoaLumberjack
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I'm on OS X 10.11.2 (El Capitan), using Xcode 7.2.

 

On https://developer.salesforce.com/trailhead/project/workshop-battle-station/battle-station-3 it says I should add resources and supplies records. But where do I do it? Don't I need to create custom tabs first? I haven't seen it mentioned in the previous steps.

To do the Lightning Trailhead challenges I need to use my Lightning Preview-account. But I can't check the challenges I have done because that requires a developer account. I have a developer account, but since the code I have written is in the Lightning Preview account it doesn't work.
Are there Lightning Preview Developer Accounts or is this a known problem?