Error Occurs: 'PRM_MissingPanel' randomly in Ajax Update Panel

When using the Ajax Update Panel in Visual Studio to handle post backs for my search function, I encounter an issue. After generating a gridview with the results (i.e., searching for a member), whenever I update to the newest version from TFS, an error is thrown:

An unhandled exception at line 1, column 132567 in http://localhost:58921/bundles/MsAjaxJs? JavaScript runtime error: Unable to get the property 'PRM_MissingPanel' of undefined or null reference

The strange thing is that after this initial error, I can debug again and it won't break until I update to a newer version once more.

Despite extensive searching, I have been unable to determine what PRM_MissingPanel refers to.

Any thoughts on why this recurring issue might be happening?

The MsAjaxBundle originates from the ScriptManager generated when creating my Web App:

    <asp:ScriptManager runat="server">
        <Scripts>
            <asp:ScriptReference Name="MsAjaxBundle" />
            <asp:ScriptReference Name="jquery" />
            <asp:ScriptReference Name="bootstrap" />
            <asp:ScriptReference Name="respond" />
            ... (additional script references)
            <asp:ScriptReference Name="WebFormsBundle" />
        </Scripts>
    </asp:ScriptManager>
javascriptc#asp.netajaxupdatepanel

Answer №1

The issue I encountered was related to hiding a div containing an update panel and then attempting to show it by changing the visibility property, but the Update Panel did not actually display.

To address this problem, I made the following modification to ensure that the update panels remain consistently visible instead of appearing and disappearing:

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <div visible="false" id="Search" runat="server">
            <div style="overflow: hidden;">

Answer №2

Experiencing a similar issue here: suddenly on my Login.aspx page, an unexpected occurrence seems to have occurred without any clear reason.

The proposed solution did not resolve the issue in my case, as my panel was not hidden. Furthermore, this same page had been functioning without any modifications for a year.

Despite trying multiple approaches, I was unable to find a solution until I added the ID="SomeUnrelevantIDhere" to the asp:UpdatePanel. Strangely, even though this ID was not utilized in the codebehind and had previously functioned fine for a year without it.

Ultimately, I managed to resolve the issue by adding ID="something" to the updatepanel in the .ascx file.

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