The error below is what I am getting:

There was a problem rendering your image gallery. Please make sure that the folder you are using in the Simple Image Gallery Pro plugin tags exists and contains valid image files. The plugin could not locate the folder:

I have an API with flickr, no special characters in names, etc.
I have searched the forums and nothing I have found has helped me.

Link to page getting error www.plopculturephoto.com/index.php/image-gallary

Please pm me access to your backend.

Sent

Your issue has been solved.
Hidden html tags in your joomla text prevented the gallery tags to work as they should.

Ahhhh... thanks for the help :)  I will check that next time

You are welcome.

I have the same issue, as many others I found on the net. I have the Flicker API, I set up the Flicker SET inside the IMAGE GALLERY sheet of JCE editor that display correctly in the preview all the pictures. But when saving the post in K2 I've got:

There was a problem rendering your image gallery. Please make sure that the folder you are using in the Simple Image Gallery Pro plugin tags exists and contains valid image files. The plugin could not locate the folder:

No folder is signalled. Anyway in the plugin (activated) the folder is "images" without slashes (default), and exist regulary.

I put in the K2's article the link that should be correct:

{gallery}www.flickr.com/photos/setipiacipiaci/sets/72157629897067087/{/gallery}

What else can i Do ?

How to look for that tags ?

Make sure that you use the latest k2 and SIG pro version please.

2.5.6 of K2 and I bought the SIG pro versione three hours ago, so latest version.

Pm me access to your super admin please.