I currently have the Inceptive Image Gallery for K2 plugin installed. I have recently tried to install the Bitsgeo Folk Gallery. Both are K2 specific plugins and both are both accessed via the Image Gallery Tab in K2.

After installed the Bitsgeo Folk Gallery, I am receiving the following error:

Fatal error: Cannot redeclare class K2ImageGalleryHelper in /home/content/39/8276939/html/plugins/k2/incptvk2imagegallery/incptvk2imagegallery/includes/helper.php on line 13

Is there a conflict when using two K2 gallery plugins? Can I only use one image gallery plugin at a time?

Hello this in not related to K2.
You need to address this issue to the gallery's developer.