The solution is to change a single entry in web.config, by modifying the line…

<SafeMode MaxControls=“200“ CallStack=“false“…

to…

<SafeMode MaxControls=“200“ CallStack=“true“…

You will also need to set custom errors to ‘Off’ .

<customErrors mode=“Off“/>

You will no longer see the “An unexpected error has occurred” error page and instead you get a lovely ’standard ASP.Net error page’ with the stack trace and everything

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