Compilation error ASPPARSE: Unknown server tag 'ajaxToolkit:ModalPopupExtender' on server

Question

Getting error ASPPARSE: Unknown server tag 'ajaxToolkit:ModalPopupExtender' error on server but its working fine on my machine. Any idea what is missing.

Answer 1

This and this may help.

In essence, the steps to rectify the issue are as follows:

To work around this problem, replace the <asp:Panel></asp:Panel> tags that contain user controls in the .aspx page with <div></div> tags. The <asp:Panel> tag is rendered as an HTML <div> element.

To replace the <asp:Panel></asp:Panel> tags in the .aspx page with <div></div> tags:

1. Open the Web page that you want to modify.
2. At the bottom of the page, click Code.
3. On the Edit menu, click Find.
4. Click the Replace tab.
5. In the Find what box, type <asp:Panel>.
6. In the Replace with box, type <div>, and then click Replace. Replace all <asp:Panel> tags that contain a user control.
7. In the Find what box, type </asp:Panel>.
8. In the Replace with box, type </div>, and then click Replace. Replace all </asp:Panel> tags that contain a user control. On the File menu, click Save.