I needed to make changes in the webpart present on a custom webpart page which was deployed using one of our solutions. I tried to edit the page by clicking on Edit link (the page can also be edited by appending ?toolpaneview=2 to the url). I got the following error message:
Cannot add Web Parts to this Web Part Page. Either there are no zones on this page or you do not have permissions to add Web Parts.
I was logged in as an administrator and the page surely had the webpart zone. I opened the the custom page of the solution in Visual studio and noticed that the property AllowCustomization was set to false as shown:
I set AllowCustomization to true and deployed the solution and was able to edit the webpart.
Cannot add Web Parts to this Web Part Page. Either there are no zones on this page or you do not have permissions to add Web Parts.
I was logged in as an administrator and the page surely had the webpart zone. I opened the the custom page of the solution in Visual studio and noticed that the property AllowCustomization was set to false as shown:
<WebPartPages:WebPartZone id="ContentZone" runat="server" title="Content Zone" Orientation="Vertical" AllowCustomization="false" FrameType="Standard"><ZoneTemplate></ZoneTemplate></WebPartPages:WebPartZone>I set AllowCustomization to true and deployed the solution and was able to edit the webpart.