html page convert into master page after not add app sharepoint 2013

After conversion html page into master page not app add into sharepoint 2013

1.create snipet of quick launch manu add the html master page ..

2. Then find this code line  <!--CE: End Vertical Navigation Snippet--> 


3.put after this code of lines .
 
   <!--SPM:<SharePoint:AjaxDelta id="DeltaPlaceHolderPageTitleInTitleArea" runat="server" >-->
   <!--SPM:<asp:ContentPlaceHolder id="PlaceHolderPageTitleInTitleArea" runat="server"  >-->
   <!--SPM:</asp:ContentPlaceHolder>-->
   <!--SPM:</SharePoint:AjaxDelta>-->


Then try Add app fine.


Example:  
   <!--CE: End Vertical Navigation Snippet-->
   <!--SPM:<SharePoint:AjaxDelta id="DeltaPlaceHolderPageTitleInTitleArea" runat="server" >-->
   <!--SPM:<asp:ContentPlaceHolder id="PlaceHolderPageTitleInTitleArea" runat="server"  >-->
   <!--SPM:</asp:ContentPlaceHolder>-->
   <!--SPM:</SharePoint:AjaxDelta>-->


             




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