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when I try to put the Image Gallery Modul on a page and give it the path for the FolderGalleryRootFolder ~/Data/Sites/1/FolderGalleries/ I get an System.UnauthorizedAccessException: access on the path "C:\inetpub\vhosts\nett.info\httpdocs\Data\systemfiles\FolderGalleryCache" was denied.
I can not see a folder ~\Data\systemfiles\FolderGalleryCache
Look for this in Web.config:
<add key="FolderGalleryCachePath" value="/Data/systemfiles" />
and change it to this:
<add key="FolderGalleryCachePath" value="~/Data/systemfiles" />
Hope it helps,