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When you are trying to add your app part to host web, then you will get this error.
Root Cause: You are missing <WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
Solution:
Add below tag in your app part pages.All the pages which you are using in app.
<WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
<asp:Content ContentPlaceHolderID="PlaceHolderMain" runat="server">
<WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
<div>
Your code
</div>
</asp:Content>
When you are trying to add your app part to host web, then you will get this error.
Root Cause: You are missing <WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
Solution:
Add below tag in your app part pages.All the pages which you are using in app.
<WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
<asp:Content ContentPlaceHolderID="PlaceHolderMain" runat="server">
<WebPartPages:AllowFraming ID="AllowFraming" runat="server" />
<div>
Your code
</div>
</asp:Content>
