Error message: Object reference not set to an instance of an object.

   at Bone.DBItem.<>c__DisplayClass46_0.b__1(DBItem item) in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 362
   at Bone.DBList`1.FindAll(Predicate`1 match) in C:\Bone\Bone\src\EngineDB\DBList.cs:line 104
   at Bone.DBItem.ExtraFieldValue(String name) in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 362
   at ASP.tpl_tiles_product_tile_ascx.<__Render__control1>b__2(ProductCategoryProduct c) in c:\inetpub\vhosts\innsaei.gr\tpl\tiles\Product.tile.ascx:line 94
   at Bone.DBList`1.FindAll(Predicate`1 match) in C:\Bone\Bone\src\EngineDB\DBList.cs:line 104
   at ASP.tpl_tiles_product_tile_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\vhosts\innsaei.gr\tpl\tiles\Product.tile.ascx:line 94
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(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 2732
   at Bone.BONE.LoadControl(String virtual_path, DBItem item, Boolean cache, Object[] objects) in C:\Bone\Bone\src\BONE.cs:line 2654
   at Bone.DBItem.TileWithInfo(Object[] objects) in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1337
   at Bone.DBItem.get_Tile() in C:\Bone\Bone\src\EngineDB\DBItem.cs:line 1347
   at Bone.TilesetControl.<>c.b__33_0(Object x) in C:\Bone\Bone\src\EngineUI\UIControls\TilesetControl.cs:line 189
   at Bone.TilesetControl.Render(TextWriter w) in C:\Bone\Bone\src\EngineUI\UIControls\TilesetControl.cs:line 216
   at Bone.UIControl.ToString() in C:\Bone\Bone\src\EngineUI\_Control.cs:line 30
   at System.IO.TextWriter.Write(Object value)
   at ASP.tpl_actionshop_tpl_ascx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\vhosts\innsaei.gr\tpl\ActionShop.tpl.ascx:line 511
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at Bone.Action.RenderContent(TextWriter w) in C:\Bone\Bone\src\Actions\_Action.cs:line 401
   at Bone.Action.ToString() in C:\Bone\Bone\src\Actions\_Action.cs:line 518
   at Bone.Base.get_Content() in C:\Bone\Bone\src\Classes\Base.cs:line 80
   at ASP.skin_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in c:\inetpub\vhosts\innsaei.gr\skin.aspx:line 277
   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.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)