PHP class problems. Cant call another class?

I have a class file: class_xx.php. And then a function file: function_xxx.phpIn my function_xxx.php:\[code\]require_once('class_xx.php')... // after few next lines$object = new class_xx1($arg1, $arg2);\[/code\]But it gives me:Fatal error: Class 'class_xx1' not found in "some_path" on line "1XX3"[sorry i cant exposed the codes yet], any idea why I included the file > require_once with no error, but it gives me "Class not found error"??
 
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