Tutorial: Local Cloud 1st Time instructions [01 Oct 15]

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I nearly got it worked but stuck at this error:

Your server IP address is: 10.x.x.x
server started { host: 'localhost', port: 5683 }
42.x.x.x - - [Wed, 01 Apr 2015 02:46:56 GMT] "POST /v1/provisioning/53xxxxxxxxxxxxxxxxx HTTP/1.1" 400 109 "-" "-"

Here is what I’ve tried on my Google cloud server so far:

$ mkdir spark-core
$ cd spark-core
$ wget https://launchpad.net/gcc-arm-embedded/4.8/4.8-2014-q2-update/+download/gcc-arm-none-eabi-4_8-2014q2-20140609-linux.tar.bz2
$ tar xvjpf gcc-arm-none-eabi-4_8-2014q2-20140609-linux.tar.bz2
$ export PATH=$PATH:$HOME/src/spark-core/gcc-arm-none-eabi-4_8-2014q2/bin
$ git clone https://github.com/spark/core-firmware.git
$ git clone https://github.com/spark/core-common-lib.git
$ git clone https://github.com/spark/core-communication-lib.git
$ git clone https://github.com/spark/spark-server.git
$ npm install -g spark-cli (need either root or sudo)
$ cd spark-server
$ npm install
$ node main.js

On my local PC with dfu-util installed, here is the following done on my PC:

$ git clone https://github.com/spark/spark-server.git
$cd spark-server
$node main.js

While my local server (on my PC) is running I then did the following on a new terminal window:

$ spark config googleCloud apiUrl http://mydomainname.com:8080
$ spark config googleCloud
$ cd spark-server
$ spark keys server default_key.pub.pem mydomainname.com

I then did this on my local server (PC with DFU-UTIL):

$cd core_keys
$sudo spark keys doctor 53fxxxxxxxxxxxxxxxxxxx

I end up with the following error message when I try to upload the keys on the spark (Spark is in DFU mode). The below DFU message was too long. I am just pasting the error message portion of it.

File downloaded successfully
Transitioning to dfuMANIFEST state
Error during download get_status
Saved!
attempting to add a new public key for core 53xxxxxxxxxxxxxxxx
*********************************
      Please login - it appears your access_token may have expired
*********************************
submitPublicKey got error:  invalid_grant
Make sure your core is in DFU mode (blinking yellow), and that your computer is online.
Error - invalid_grant

On my google cloud server, I got the following error:

Your server IP address is: 10.x.x.x
server started { host: 'localhost', port: 5683 }
42.x.x.x - - [Wed, 01 Apr 2015 02:46:56 GMT] "POST /v1/provisioning/53xxxxxxxxxxxxxxxxx HTTP/1.1" 400 109 "-" "-"

What am I doing wrong? Any help would be highly appreciated.