Setting up Google Drive for eDocman

I have followed the procedures, but when I click the burron in the Google Drive plug-in I get the following message:
Error 400: redirect_uri_mismatch
The redirect URI in the request, oasttheatre.com/administrator/index.php?...gledriveauthenticate , does not match the ones authorized for the OAuth client. To update the authorized redirect URIs, visit: console.developers.google.com/apis/crede...{your_project_number }

When I substitute in the values for my client ID and my project number (with or without curly brackets) I get:
There was an error while loading /apis/credentials/oauthclient/$%7B188098921649-q602q4fqhiudts2eaujpnli0cr098g6q.apps.googleusercontent.com%7D?project=$%7B188098921649%7D. Please try again.

These are definitely my correct client ID and Project number. I do not know how to proceed.

Thank you

Hi Peter,
With this kind of issue, you need to add my Skype: thucdam84, and we will work together to solve the issue. I will need to login to your Google account to check your Gdrive Application
Thanks
Dam