AttributeError: module 'appsys.models' has no attribute 'CharField'

This error message indicates that the CharField attribute is not defined in the models module of the appsys package. This could be caused by a few different things:

1. The attribute is misspelled or capitalized incorrectly. Make sure that you are using the correct spelling and capitalization for the attribute.

2. The attribute is not defined in the models module. You may need to import it from another module or define it yourself.

3. There is an issue with the installation of the appsys package. Try reinstalling the package or checking for updates to make sure that all necessary components are installed correctly.