Can't lower my build parallelism

I’m a new to CirleCI
Today I’ve created account and try to add my OpenSource project on GitHub.
I’ve done some integration and tried some parallelism (system allow me to use 4 containers). But after some time (when parallelism was set to 2 containers) the management of parallelism hangs out and I can’t change anything (neither increase nor decrease it).
Can you help me?

Now it woks again normally.

But I got such error from default nosetests:

Traceback (most recent call last):
File “/opt/circleci/python/3.5.2/lib/python3.5/unittest/”, line 58, in testPartExecutor
File “/opt/circleci/python/3.5.2/lib/python3.5/unittest/”, line 600, in run
File “/home/ubuntu/virtualenvs/venv-3.5.2/lib/python3.5/site-packages/nose/”, line 42, in runTest
raise self.exc_class(self.exc_val)
ValueError: Can’t find callable test_Disk in file /home/ubuntu/yandex-disk-client/test-Disk: file is not a python module

When I override test command to nosetests -v - it works, but it doesn’t use parallelism (default nosetests can work with it).

How to fix default nosetests issue?

Anybody have any idea how to fix it?

It’s pity that such a good service have such a week support…:confused: