Magento Error: Method Varien_Object::__tostring() cannot take arguments

If you encountered a bug in Magento that says:
Method Varien_Object::__tostring() cannot take arguments
and you have PHP 5.3 or newer then you have 2 options:
1) downgrade to PHP 2.9
2) fix the bugs

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Source: http://de77.com/php/magento-error-method-varien_object__tostring-cannot-take-arguments