Community auth not working

i have installed @skunkbad's Community Auth in my CI3 site followed by the instructions.

i was able to create a dummy user by editing the user_data array that is inside the create_user method, and that creates a user in the database as well.

now once i try to login, it always shows that username/password doesnt matched!

Login Error: Invalid Username, Email Address, or Password.

Username, email address and password are all case sensitive.

Any idea