Hi,

I tested on Ubuntu also, it works fine, I can't reproduce the issue you are facing, try Googling the error.

Hi,

I just tested by uninstalling and reinstalling it, and it works fine, result:

PS C:\Users\afhac\source\OpenApiPy> pip uninstall ctrader-open-api
Found existing installation: ctrader-open-api 0.9.0
Uninstalling ctrader-open-api-0.9.0:
  Would remove:
    c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages\ctrader_open_api-0.9.0.dist-info\*
    c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages\ctrader_open_api\*
    c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages\license
Proceed (Y/n)? y
  Successfully uninstalled ctrader-open-api-0.9.0
PS C:\Users\afhac\source\OpenApiPy> pip install ctrader-open-api
Collecting ctrader-open-api
  Using cached ctrader_open_api-0.9.0-py3-none-any.whl (29 kB)
Requirement already satisfied: protobuf==3.19.1 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from ctrader-open-api) (3.19.1)
Requirement already satisfied: Twisted==21.7.0 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from ctrader-open-api) (21.7.0)
Requirement already satisfied: Automat>=0.8.0 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (20.2.0)
Requirement already satisfied: constantly>=15.1 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (15.1.0)
Requirement already satisfied: twisted-iocpsupport~=1.0.0 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (1.0.2)
Requirement already satisfied: typing-extensions>=3.6.5 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (4.0.0)
Requirement already satisfied: zope.interface>=4.4.2 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (5.4.0)
Requirement already satisfied: incremental>=21.3.0 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (21.3.0)
Requirement already satisfied: hyperlink>=17.1.1 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (21.0.0)
Requirement already satisfied: attrs>=19.2.0 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Twisted==21.7.0->ctrader-open-api) (21.2.0)
Requirement already satisfied: six in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from Automat>=0.8.0->Twisted==21.7.0->ctrader-open-api) (1.16.0)
Requirement already satisfied: idna>=2.5 in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from hyperlink>=17.1.1->Twisted==21.7.0->ctrader-open-api) (3.3)
Requirement already satisfied: setuptools in c:\users\afhac\appdata\local\programs\python\python39\lib\site-packages (from zope.interface>=4.4.2->Twisted==21.7.0->ctrader-open-api) (56.0.0)
Installing collected packages: ctrader-open-api
Successfully installed ctrader-open-api-0.9.0
PS C:\Users\afhac\source\OpenApiPy>

I tested on Windows 11.

Can you tell me on which OS you got that error? which version of Python and Pip you were using?