Error message: Specified cast is not valid.

Url: http://allforoffice.gr/skin.aspx?lang=el&action=newarrivals&categories=2A7804DB‡F8077BC9‡B472BA8D‡84C5F8DC‡FC5A23B0‡F73347A7‡0162D43A‡51466317&splitter_products_offset=0
Message: Specified cast is not valid.
   at Ecommerce.Product.get_UserPrice() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 482
   at Ecommerce.Product.get_PriceBeforeDiscount() in C:\Bone\Ecommerce\src\DBItems\Product\Product.cs:line 503
   at ASP.tpl_tiles_product_tile_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\allforoffice\tpl\tiles\Product.tile.ascx:line 30
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at Bone.BONE.LoadControl(String virtual_path, DBItem item, Boolean cache, Boolean hide_debug_sign, Object[] objects, String default_if_file_no_exists) in C:\Bone\Bone\src\BONE.cs:line 3128
   at Bone.BONE.LoadControl(String virtual_path, DBItem item, Boolean cache, Object[] objects) in C:\Bone\Bone\src\BONE.cs:line 2987
   at Bone.DBItem.TileWithInfo(Object[] objects) in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1735
   at Bone.DBItem.get_Tile() in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1745
   at Ecommerce.ProductsControl.<>c.b__203_0(Object x) in C:\Bone\Ecommerce\src\Controls\ProductsControl.cs:line 1507
   at Bone.TilesetControl.Render(TextWriter w) in C:\Bone\Bone\src\EngineUI\UIControls\TilesetControl.cs:line 249
   at Bone.UIControl.ToString() in C:\Bone\Bone\src\EngineUI\_Control.cs:line 30
   at System.Text.StringBuilder.Append(Object value)
   at Ecommerce.ProductsControl.get_ProductsGridControl() in C:\Bone\Ecommerce\src\Controls\ProductsControl.cs:line 1516
   at Ecommerce.ProductsControl.Render(TextWriter w) in C:\Bone\Ecommerce\src\Controls\ProductsControl.cs:line 817
   at Bone.UIControl.ToString() in C:\Bone\Bone\src\EngineUI\_Control.cs:line 30
   at System.IO.TextWriter.Write(Object value)
   at ASP.tpl_actionnewarrivals_tpl_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\allforoffice\tpl\ActionNewArrivals.tpl.ascx:line 108
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at Bone.Action.RenderContent(TextWriter w) in C:\Bone\Bone\src\Actions\_Action.cs:line 409
   at Bone.Action.ToString() in C:\Bone\Bone\src\Actions\_Action.cs:line 526
   at Bone.Base.get_Content() in C:\Bone\Bone\src\Classes\Base.cs:line 81
   at ASP.skin_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\allforoffice\skin.aspx:line 370
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Page.Render(HtmlTextWriter writer)
   at Bone.Asp.RenderSkin(TextWriter w) in C:\Bone\Bone\src\Classes\Asp.cs:line 71
   at Bone.ModalAction.RenderPage(TextWriter w) in C:\Bone\Bone\src\Actions\Modal.cs:line 81
   at Bone.Asp.Render(HtmlTextWriter w) in C:\Bone\Bone\src\Classes\Asp.cs:line 82
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)