Fatal Error: a call to the undefined class 'IDString' has been initiated and has been passed to __autoload() (functions_slim.php) for recovery, but either an error was encountered loading the class library or this class has not been defined in the necessary $class_reference array.

If this is an incomplete object (likely the result of an unserialize() request) please add this class to the Array array. Otherwise, please correct the code to address this error.

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