"Invalid mode for clean() method" errors after upgrading to 1.4

When upgrading to Magento v1.4+ from a previous version you may get an error "Invalid mode for clean() method". 

This occurs because of a change in the Zend Framework shipped with Magento.

To fix the error, delete the /app/code/core/Zend/Cache directory.

Note: With Magento v1.4.0.1, error reporting is switched off. To switch error reporting on, rename /errors/local.xml.sample to /errors/local.xml. Rename it back again on production websites.

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