For some reason this forum stripped out my image tags..

I'lll try again..

You can see the images at...(you may have to copy and paste them from here)

http://www.users.on.net/~bradford/Images/Umbraco/UmbracoError1.jpg

and

http://www.users.on.net/~bradford/Images/Umbraco/UmbracoError2.jpg

here goes..

Content placeholder ID's aren't recursive, if the direct parent doesn't have a <asp:Content ID="ContentPlaceholderDefault" runat="server" /> then you will receive the error.

The umbraco 'default' masterpage has that Content Placeholder, but my assumption is that you haven't created it in your Master.master file.

When you create a new masterpage from the Umbraco UI it uses a standard template, it doesn't look at the specified parent to create the appropriate Content Placeholders (like Visual Studio does).

I got it sussed.

The Master Template was created first, and  put one of these

<umbraco:Item field="bodyText" runat="server"></umbraco:Item>

in it at the spot I wanted the content of the pages to appear. Wrong.

It needed to be this..

 <asp:ContentPlaceHolder Id="masterContentPlaceHolder" runat="server"/>

Then in the Home Doc type and the Page Doc type templates, I just had to do this.

<asp:Content ContentPlaceHolderId="MasterContentPlaceHolder" runat="server">
    <umbraco:Item field="bodyText" runat="server"></umbraco:Item>
</asp:Content>

I think I understand why to got this error but I'm not sure why it happened at all (how I could have messed it up so much).  At least I'll know where to start looking it happens again :)

I encountered a similar error first time after install Umbraco by WebMatrix today. The error come when accessing the 'Company Blog Post' page.

Cannot find ContentPlaceHolder 'cp_header' in the master page '/masterpages/umbMaster', verify content control's ContentPlaceHolderID attribute in the content page

 Diving into Settings > Templates > Starterkit Master: Blog post page. I find this .js container with 'cp_head' id

<asp:Content ContentPlaceHolderId="cp_head" runat="server">
  <script type="text/javascript" src="/umbraco_client/ui/jquery.js">script>
  <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery.validate/1.5.5/jquery.validate.min.js">script>
asp:Content>

while in the 'Starterkit master' page (alias umbMaster) id of the corresponding element is: HeadContent , changing the first line above to:

<asp:Content ContentPlaceHolderId="HeadContent" runat="server">

solves the mismatching.

You can check the source code of the 'Company blog post' to see all these .js go into the same place.

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