No module named 'sclack'

I followed the build instrucitons and used the pip3 install, but when I launch app.py, I get this

```
$ ./app.py
Traceback (most recent call last):
File "./app.py", line 14, in
from sclack.components import Attachment, Channel, ChannelHeader, ChatBox, Dm
ModuleNotFoundError: No module named 'sclack'
```

Here is the output from the install:

```
$ pip3 install -r requirements.txt
Requirement already satisfied: asyncio in /usr/local/lib/python3.6/site-packages (from -r requirements.txt (line 1))
Requirement already satisfied: urwid==2.0.1 in /usr/local/lib64/python3.6/site-packages (from -r requirements.txt (line 2))
Requirement already satisfied: pyperclip==1.6.2 in /usr/local/lib/python3.6/site-packages (from -r requirements.txt (line 3))
Requirement already satisfied: requests in /usr/lib/python3.6/site-packages (from -r requirements.txt (line 4))
Requirement already satisfied: slackclient==1.2.1 in /usr/local/lib/python3.6/site-packages (from -r requirements.txt (line 5))
Requirement already satisfied: urwid_readline in /usr/local/lib/python3.6/site-packages (from -r requirements.txt (line 6))
Requirement already satisfied: websocket-client==0.47.0 in /usr/local/lib/python3.6/site-packages (from -r requirements.txt (line 7))
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in /usr/lib/python3.6/site-packages (from requests->-r requirements.txt (line 4))
Requirement already satisfied: idna<2.8,>=2.5 in /usr/lib/python3.6/site-packages (from requests->-r requirements.txt (line 4))
Requirement already satisfied: urllib3<1.25,>=1.21.1 in /usr/lib/python3.6/site-packages (from requests->-r requirements.txt (line 4))
Requirement already satisfied: six<2.0a0,>=1.10 in /usr/lib/python3.6/site-packages (from slackclient==1.2.1->-r requirements.txt (line 5))
```

Im running this on Centos 8 fully updated

Any ideas?

Thanks!
Joe