How do I fix a compilation error?

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2.50/5 (2 votes)

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I'm currently receiving an error that reads:
Element 'X' is not a know element. This can occur if there is a compilation error in the Web site, or the web.config file is missing.

I should note that this is happening within a webform I've added which also has a default masterpage. The file type is .aspx the code below shows how I've configured the web form excluding the actual content.

VB

<%@ Page Title="" Language="C#" MasterPageFile="~/Default.Master" AutoEventWireup="true" CodeBehind="SearchPage.aspx.cs"
     Inherits="Project.Search_Page.SearchPage" %>

<%@ MasterType VirtualPath="~/Default.master" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="AjaxToolkit" %>
<%@ Register Src="~/Controls/InfoMessage.ascx" TagName="InfoMsg" TagPrefix="CustCntl" %>
<%@ Register Src="~/Controls/ContentBox.ascx" TagName="ContentBox" TagPrefix="CustCntl" %>
<%@ Register Src="~/Controls/ModalBox.ascx" TagName="ModalBox" TagPrefix="CustCntl" %>
<%@ Register Src="~/Controls/GridViewHeader.ascx" TagName="GVHeader" TagPrefix="CustCntl" %>
<%@ Register Assembly="Custom.Web.UI" Namespace="Custom.Web.UI" TagPrefix="Custom" %>

I don't know what is causing this issue because I have the exact same code, at least from MasterType VirtualPath = "~/Default..... down to everything below. I've also checked my web config file and didn't find any issues there.

Any ideas on how to approach/fix this error?

Posted 22-Jul-15 4:27am

Member 11820531

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Comments

Andy Lanng 22-Jul-15 10:44am

First off you need to know where the problem is.
1: Create a blank page
2: check it works (sounds silly but I always check the blank page!)
3: register one of the controls from the erring page
4: check it works

repeat steps 3 & 4 until it errors. If it doesn't (or the blank page errors) then your issue is elsewhere.

Member 11820531 22-Jul-15 11:16am

Thanks you, that way approaching this issue has helped!

ZurdoDev 22-Jul-15 11:20am

1. Reply to the comment so that the user is notified.
2. What is the exact error? It will tell you exactly what the issue is.

Sreekanth Mothukuru 25-Jul-15 2:15am

I'm quite sure the 'X' must be his control tag prefix 'CustCntl'!!

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