The selected placeholder no longer exists

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Hi everyone,  I've been trying to add security to my app, so I have added the 'Administration' module.  A lot of errors popped up, most of which I have dealt with. I am getting these errors;  I've had a look at the page, but can't fine an option to select a different placeholder or page template.  Example of page below;
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1 answers
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Hi Garion,

The problem is in the Popup layout. Open the layout and make sure the placeholder is there and has the correct name.

-Andrej

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