Dear Nagraj,
Have you modified your skins?
If you have added new panes, i.e. paneA, paneB etc.. within the skin, then these names need to be declared.
These are declared in the skin.xml that accompanies your skin... Just add them to the xml file and your set to go.
The path should be something like this: DotNetNuke_Install\Portals\_default\Skins\DNN-Blue\skin.xml
Here is an example of my skin file:
<Token>[RightPane1]Token>
Object>
<Token>[RightPane2]Token>
Object>
<Value>TreeViewMenuValue>
Setting>
<Name>headerCssClassName>
<Value>TreeViewMenu_HeaderValue>
Setting>
<Name>headerTextCssClassName>
Setting>
<Name>treeIndentWidthName>
Setting>
Settings>
Object>
<Token>[SOLPARTMENU:1]Token>
<Name>userootbreadcrumbarrowName>
Setting>
<Name>usesubmenubreadcrumbarrowName>
Setting>
<Name>rootmenuitemcssclassName>
<Value>rootmenuitemValue>
Setting>
<Name>rootmenuitemselectedcssclassName>
<Value>rootmenuitemselectedValue>
Setting>
<Name>rootmenuitembreadcrumbcssclassName>
<Value>rootmenuitembreadcrumbValue>
Setting>
<Name>submenucssclassName>
Setting>
<Name>submenuitemselectedcssclassName>
<Value>submenuitemselectedValue>
Setting>
<Name>submenuitembreadcrumbcssclassName>
<Value>submenuitembreadcrumbValue>
Setting>
<Name>CSSNodeSelectedRootName>
<Value>rootmenuitembreadcrumbValue>
Setting>
<Name>CSSNodeSelectedSubName>
<Value>submenuitemselectedValue>
Setting>
Settings>
Object>
<Token>[SOLPARTMENU:2]Token>
<Name>userootbreadcrumbarrowName>
Setting>
<Name>usesubmenubreadcrumbarrowName>
Setting>
<Name>rootmenuitemcssclassName>
<Value>rootmenuitemValue>
Setting>
<Name>rootmenuitemselectedcssclassName>
<Value>rootmenuitemselectedValue>
Setting>
<Name>rootmenuitembreadcrumbcssclassName>
<Value>rootmenuitembreadcrumbValue>
Setting>
<Name>submenucssclassName>
Setting>
<Name>submenuitemselectedcssclassName>
<Value>submenuitemselectedValue>
Setting>
<Name>submenuitembreadcrumbcssclassName>
<Value>submenuitembreadcrumbValue>
Setting>
<Name>CSSNodeSelectedRootName>
<Value>rootmenuitembreadcrumbValue>
Setting>
<Name>CSSNodeSelectedSubName>
<Value>submenuitemselectedValue>
Setting>
Settings>
Object>
<Token>[BREADCRUMB]Token>
Object>
<Token>[CURRENTDATE]Token>
Object>
<Value>links_bottomValue>
Setting>
Settings>
Object>
Objects>