PHPExcel (File format or extension not valid)

Hello Fellows,

I'm using PhpExcel (by Segy -> https://github.com/segy/PhpExcel ) for export my query in excel file; however after I created file(which is xslx format), I can not open my file in excel. It gives "the file format or extension is not valid. 

I've tried to reduce the problem by only:

    creating the WorkSheet: $this->PhpExcel->createWorksheet();,

    adding a Table Header: $this->PhpExcel->addTableHeader($table, array('name' => 'Cambria', 'bold' => true));,

    adding a TableRow $this->PhpExcel->addTableRow(..)

    and calling $this->PhpExcel->output(); to generate the file

and the problem it's still there.

Any suggestions about how I can fix it?

Thanks for reading.

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