Error in generating token file through DropBox Token Authorization Tool

The token this tool generates is called an "access token", which is user-specific. Normally, a Dropbox API app is used for a large number of users (not just the developer/owner of the app). That being the case, the normal way to get a token is to send each user through an OAuth flow (as the tool does) and store the token. (The user normally doesn't need to see or handle the token themselves.)

If you do want to be able to quickly get an access token for an app on your own account though, the App Console does have a button for generating one. Note that it generates an OAuth 2 access token though, whereas the DropBoxTokenIssuer.exe tool retrieves an OAuth 1 access token.