TYPO3 Exception 1257146403¶

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Happened with invalid values for <switchableControllerActions>. Code looked like this:

<numIndex index="1" type="array">
    <numIndex index="0">My Data</numIndex>
    <numIndex index="1">Member->myInvestmentData;Member->show;Member->edit;Member-update;Investment->list;Investment->show;Investment->new;Investment->create;Investment->edit;Investment->update;Investment->delete</numIndex>
</numIndex>

Notice the missing > for Member-update (should be Member->update). Have a look at FrontendConfigurationManager to see what values are expected.