[Fixed]-How to share models between applications?

As the error message says, as of Django 1.8 you need to explicitly tell ConfigurationForm which model fields you want to include, using either the fields or exclude class attribute. If you want all of the fields, you can simply say fields = '__all__'. Django no longer assumes that automatically.

There are several indentation and spelling errors in the code you posted, which make it hard to follow. The best way to avoid that is to copy and paste your actual code rather than typing it in.