New Post: problem /Classes/PHPExcel/Writer/Excel2007.php 219

hello all
I've been working in the past and now I do not know what the problem please help
centos 6.5 cpanel
PHP 5.3.28 (cli) (built: Jan 21 2014 19:09:57)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2013 Zend Technologies

with XCache v3.0.3, Copyright (c) 2005-2013, by mOo
with the ionCube PHP Loader v4.4.1, Copyright (c) 2002-2013, by ionCube Ltd., and
with Zend Guard Loader v3.3, Copyright (c) 1998-2010, by Zend Technologies
with XCache Cacher v3.0.3, Copyright (c) 2005-2013, by mOo
with Suhosin v0.9.33, Copyright (c) 2007-2012, by SektionEins GmbH

and promotion /tmp 1777
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<b>Warning</b>: ZipArchive::open() [<a href='ziparchive.open'>ziparchive.open</a>]: Unable to access php://output in <b>/home/sam/public_html/Classes/PHPExcel/Writer/Excel2007.php</b> on line <b>217</b><br />
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<b>Warning</b>: ZipArchive::open() [<a href='ziparchive.open'>ziparchive.open</a>]: Unable to access php://output in <b>/home/sam/public_html/Classes/PHPExcel/Writer/Excel2007.php</b> on line <b>218</b><br />
<br />
<b>Fatal error</b>: Uncaught exception 'PHPExcel_Writer_Exception' with message 'Could not open php://output for writing.' in /home/sam/public_html/Classes/PHPExcel/Writer/Excel2007.php:219
Stack trace:
0/home/sam/public_html/01simple-download-xlsx.php(83): PHPExcel_Writer_Excel2007->save('php://output')
1 {main}
thrown in <b>/home/sam/public_html/Classes/PHPExcel/Writer/Excel2007.php</b> on line <b>219</b><br />