Fitbit Developers oversee the SDK and API forums. We're here to answer questions about Fitbit developer tools, assist with projects, and make sure your voice is heard by the development team.
Hi @Ebrahimaa,
Welcome to the forums!
An error 1101 sounds like the issue might be within your code. Can you try going through your OAuth 2.0 Tutorial in your application management settings at dev.fitbit.com? The tutorial will give you a walkthrough to authorizing your application without your actual code. This may help in determining what is throwing the error on your end.
If you still need further assistance, please let me know and I'll be happy to help you further.
Best Answer