The project currently contains references to more than one version of DotNetNuke,a direct reference to version 5.6.1.238 and an indirect reference 
(through 'DotNetNuke.Web.UI.RibbonBarManager.GetPagesList') to version 5.6.2.144. Change the direct reference to use version 5.6.2.144 (or higher) of DotNetNuke in  \admin\ControlPanel\UpdatePage.ascx.vb and \admin\ControlPanel\AddPage.ascx.vb

It appears that there is a bit of a mixup in the versioning and DotNetNuke assembly version referenced in the DotNetNuke.Web.dll located in your site's \bin folder.

Please advise the following:

1. Version of DotNetNuke framework installed: 5.6.1 or 5.6.2 ? Did you recently attempt to upgrade from 5.6.1 (or an earlier version) to 5.6.2.

2. The file/product version of the following two assemblies in the site's \bin folder:

DotNetNuke .dll
DotNetNuke.Web.dll

In looking at the install and upgrade packages for both DotNetNuke v 5.6.1 and 5.6.2 it is interesting to note that both packages include DotNetNuke.Web.dll assembly with a file/product version of 5.6.1.0. HOWEVER, it is interesting to note (through .Net Reflector)  that this assembly in the DotNetNuke v 5.6.1 packages references DotNetNuke.dll assembly 5.6.1.238 while that in the DotNetNuke v 5.6.2 packages references DotNetNuke.dll assembly 5.6.2.144. So, while both DotNetNuke.Web.dll assemblies will have a file/product version of 5.6.1.0, they are NOT the same file.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
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