As far as I'm aware, this "Cannot assign by reference to overloaded object" problem typically appears when code attempts to assign a reference to an object that does not permit it, particularly in CakePHP code.
I would recommend looking for a line in the MigrationComponent or an event handler that reads something like '$var =& $object', where '$object' is an object that has specific methods overloaded. You can prevent assignment by reference or update CakePHP to a newer version, which addresses the issue sometimes.
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