Failed to open/load stream
For sliders that include a stream from Facebook, Twitter, Instagram, flickr, YouTube, Vimeo and at some point show a "Failed to open/load stream" error message.
In most cases there is a problem with the API credentials. Please take a second look and check the settings.
The other most common issue is that server hosting companies disable stream wrappers.
Especially when you find error messages like this in your logs
PHP Warning: file_get_contents(https://api.flickr.com/services/rest/?…): failed to open stream: no suitable wrapper could
you should contact your server admins / hosting company to enable stream wrappers in the php.ini file.