[yocto] ERROR: Unable to connect to bitbake server, or start one

[Gera Pesikoff]

I figured out that the new function findTopdir (Submitted on July 18, 2017) does
not handle the errors of the absence of the BBPATH variable and path to the
conf/bblayers.conf in BBATH. It just returns None.

  On Thu, 2017-08-24 at 18:24 +0300, Gera Pesikoff wrote:
  > Hi
  > I started to study bitbake and decided to repeat the BitBake Hello
  > World from the manual
  > (http://www.yoctoproject.org/docs/2.3.1/bitbake-user-manual/bitbake-user-manual.html#bitbake-hello-world).
  > I do everything according to the instructions, but when I run the
  > bitbake command, I get the following output:
  >
  > NOTE: Retrying server connection... (Traceback (most recent call
  > last):
  > File "/home/leonid/test/bitbake/lib/bb/main.py", line 432, in
  > setup_bitbake
  > topdir, lock = lockBitbake()
  > File "/home/leonid/test/bitbake/lib/bb/main.py", line 484, in
  > lockBitbake
  > lockfile = topdir + "/bitbake.lock"
  > TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'
  > )
  >
  > This is repeated five times, and at the end:
  >
  > ERROR: Unable to connect to bitbake server, or start one

  Are you running bitbake from the build folder (TOPDIR)?
  >
  > Could someone please tell me what the problem is and what I can do
  > about it?
  > I'm using Kubuntu 17.04 and clear Ubuntu 17.04. BitBake Build Tool
  > Core version 1.35.0
  >
  > --
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