If you see errors on site pages and you can't determine the cause, use administrator preview mode to look at them in context and in greater detail.
| Available in: both Salesforce Classic and Lightning Experience |
| Available in: Developer, Enterprise, Performance, and Unlimited Editions |
| User Permissions Needed | |
|---|---|
| To create and edit Salesforce Sites: | Customize Application |
The detailed error messages in administrator preview mode are driven by the <site:previewAsAdmin /> component in your
Visualforce error pages. Starting with Summer '10, new organizations include the
<site:previewAsAdmin /> component
by default in standard error
pages. You must add the component manually to all custom error pages and
pages from older organizations. We recommend that you add it right before the
closing </apex:page> tag, like
this:
<site:previewAsAdmin />
</apex:page><site:previewAsAdmin />
component contains the <apex:messages
/> tag, so if you have that tag elsewhere on your error pages, you
will see the detailed error message twice.
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