New Unicorn Hat not working

Thanks for that idea. However, it lead to the same error. See below for the output.
Should I uninstall Unicorn Hat's library beforehand? Or what else would you suggest?

pi@raspberrypi:~ $ git clone https://github.com/pimoroni/unicorn-hat.git
Cloning into 'unicorn-hat'...
remote: Counting objects: 1181, done.
remote: Compressing objects: 100% (14/14), done.
remote: Total 1181 (delta 5), reused 0 (delta 0), pack-reused 1167
Receiving objects: 100% (1181/1181), 759.89 KiB | 0 bytes/s, done.
Resolving deltas: 100% (650/650), done.
Checking connectivity... done.
pi@raspberrypi:~ $ cd unicorn-hat/python/UnicornHat
pi@raspberrypi:~/unicorn-hat/python/UnicornHat $ sudo python setup.py install
running install
running bdist_egg
running egg_info
creating unicornhat.egg-info
writing requirements to unicornhat.egg-info/requires.txt
writing unicornhat.egg-info/PKG-INFO
writing top-level names to unicornhat.egg-info/top_level.txt
writing dependency_links to unicornhat.egg-info/dependency_links.txt
writing manifest file 'unicornhat.egg-info/SOURCES.txt'
reading manifest file 'unicornhat.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'unicornhat.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-armv7l/egg
running install_lib
running build_py
creating build
creating build/lib.linux-armv7l-2.7
copying unicornhat.py -> build/lib.linux-armv7l-2.7
creating build/bdist.linux-armv7l
creating build/bdist.linux-armv7l/egg
copying build/lib.linux-armv7l-2.7/unicornhat.py -> build/bdist.linux-armv7l/egg
byte-compiling build/bdist.linux-armv7l/egg/unicornhat.py to unicornhat.pyc
creating build/bdist.linux-armv7l/egg/EGG-INFO
copying unicornhat.egg-info/PKG-INFO -> build/bdist.linux-armv7l/egg/EGG-INFO
copying unicornhat.egg-info/SOURCES.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying unicornhat.egg-info/dependency_links.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying unicornhat.egg-info/requires.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
copying unicornhat.egg-info/top_level.txt -> build/bdist.linux-armv7l/egg/EGG-INFO
zip_safe flag not set; analyzing archive contents...
creating dist
creating 'dist/unicornhat-2.1.0-py2.7.egg' and adding 'build/bdist.linux-armv7l/egg' to it
removing 'build/bdist.linux-armv7l/egg' (and everything under it)
Processing unicornhat-2.1.0-py2.7.egg
Copying unicornhat-2.1.0-py2.7.egg to /usr/local/lib/python2.7/dist-packages
Adding unicornhat 2.1.0 to easy-install.pth file

Installed /usr/local/lib/python2.7/dist-packages/unicornhat-2.1.0-py2.7.egg
Processing dependencies for unicornhat==2.1.0
Searching for rpi-ws281x==2.0.1
Best match: rpi-ws281x 2.0.1
Adding rpi-ws281x 2.0.1 to easy-install.pth file

Using /usr/local/lib/python2.7/dist-packages
Finished processing dependencies for unicornhat==2.1.0
pi@raspberrypi:~/unicorn-hat/python/UnicornHat $ cd ../examples
pi@raspberrypi:~/unicorn-hat/python/examples $ sudo python simple.py
Traceback (most recent call last):
File "simple.py", line 3, in
import unicornhat as UH
File "build/bdist.linux-armv7l/egg/unicornhat.py", line 14, in
ws2812.begin()
File "/usr/local/lib/python2.7/dist-packages/neopixel.py", line 114, in begin
raise RuntimeError('ws2811_init failed with code {0}'.format(resp))
RuntimeError: ws2811_init failed with code -1
Exiting cleanly