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Home/ Questions/Q 1079515
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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T21:52:56+00:00 2026-05-16T21:52:56+00:00

When i try to preview a page in my Sitecore solution, i get this

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When i try to preview a page in my Sitecore solution, i get this asp.net error;

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>). 

What could be causing this – it is only showing in preview mode, any other works fine?

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  1. Editorial Team
    Editorial Team
    2026-05-16T21:52:57+00:00Added an answer on May 16, 2026 at 9:52 pm

    Take a look at presentation components troubleshooting document, paragraph 5.2.

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