Magento Collection on Mysql4 = No such file or directory

I downloaded a module and inside it there’s a particular call as:
Mage::getModel(‘module/statistic_collection’), this provides me the error message “failed to open stream: No such file or directory” through this path: Namespace/Module/Model/Statistic/Collection.php however it occurs here: Namespace/Module/Model/Mysql4/Statistic/Collection.php .

So, how do i express magento that they must add some Mysql4 folder ?

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