This kind of error can happen when you are using Smart Objects.  This kind of layer is something the plug-ins are not compatible with.  You would want to rasterize the Smart Object first.

For Essentials owners, this typically indicates a situation where the image open in Elements is in Indexed color mode or Bitmap color mode.  Go up to the Image menu, select Mode, and change to RGB.  If the 8-bit option is also unchecked, select that option since the image you’ve opened is most likely in 16-bit mode.