Spacemacs - 'Cannot make side window the only window'

I like using neotree, SPC-p-t, and I rely on it to open, rename, move and create  files.

The other day I tried to create a new file and got an error, "Cannot make side window the only window"

It turns out that it is easily fixed using SPC-f-e-R or spacemacs/reload.  This will reset the layout of all the frames or the layers or something, but the bottom line is it fixes the problem and now I can make new files with neotree.

I made a page about my initial experience with the HobbyKing TinyBoy Mini Fabrikator.  It is sort of a review of the Fabrikator Mini.  Some pictures of the print quality.  How I resolved my feeder issue.

http://llsouder.blogspot.com/p/i-bought-hobbyking.html

Building A Line Following Robot

Bought the Arduino.  Bought the Controller.  Bought the sensor.  I played around with the Arduino and learn to make it do stuff.  Blink an LED.  Blink 2 LEDs.  Press a button and light an LED.

I got a couple of electric motors to turn with the controller, but I could never get wheels to attach to the motors.

Months go by, then I saw it. The $8.97 Yellow Ford Mustang remote control car from Wal-Mart.  I played with the car a bit and at last today, I took the car apart.  To my delight, I found the steering motor and drive motors are connected to the car with plugs.  I simply unplugged them and now I can't wait to connect the Arduino and play around.  I will start by making the car go in a define pattern, like the old Big Trak toy.

Finished... but I didn't document the progress.