It didn’t help to deactivate the theme/plugins but
i didn’t create the Dropbox-App with Access type:”Full box”.
When i made a second Dropbox-App with the correct Access Type
i had to hardcode my Key & Password, because there were no possibilites to
reset after the first installation.
Go to the “dropbox-photo-sideloader.php” in the plugins folder and
define the Variables at Line 16/17 manually.
/*
// These aren't needed anymore, but you can use them in your wp-config.php if you want to skip the configuration steps in the plugin screen. */
define('DROPBOX_KEY', 'put your dropbox app key in here');
define('DROPBOX_SECRET', 'put your dropbox app secret in here');
It then started working.
Hope it helps you.
