DBI Err Fatal! LG L70 Dual

Hi! When i install android SlimLP Alpha 5.1.1 and reboot device, i get this error
DBI Err Fatal!
DemiGod Crash Handler : DBI Err Fatal!

Board Rev.:1.0
Ram dump mode.
Option : SD card ram dump mode.
Push below files to sdcard before test.
rdcookie.txt, rtcookie.txt

Please do folliwing action.
1) Ram dump Mode. Please connect USB.
2) Get the ram dump image using QPST Configuration.
3) If sdcard ram dump enabled just wait for reboot.
4) Collect ramdump files from your pc or sdcard.
5) Send e-mail to W5-BSP-Global@lge.com

Help me, please)

fatal: ambiguous argument 'kernel' error

I am attempting to compile an AOSP kernel using a guide from Android's official website/wiki itself. Part of the guide instructs to run the command:

Code:

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git log --max-count=1 kernel

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however I'm getting the following message when I run that:

Code:

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fatal: ambiguous argument 'kernel': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

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I'm building for the Nexus 5 (hammerhead). I have absolutely no prior knowledge for kernel development and I'm wondering what to include to not make the command ambiguous?