Excel sheet corrupted after conditional formatting - phpexcel

I am generating an excel sheet with phpexcel, when using conditional formatting with the condition being (search for a text or part of it), i get a validation error when trying to open the generated sheet. Works perfectly with numbers, Less so WITH TEXTS.
Here is my code :
//conditional formatting
$objConditional1 = new PHPExcel_Style_Conditional();
$objConditional1->setConditionType(PHPExcel_Style_Conditional::CONDITION_CONTAINSTEXT)
->setOperatorType(PHPExcel_Style_Conditional::OPERATOR_CONTAINSTEXT)
->addCondition('X');
$objConditional1->getStyle()->getFont()->getColor()->setARGB(PHPExcel_Style_Color::COLOR_YELLOW);
$objConditional3 = new PHPExcel_Style_Conditional();
$objConditional3->setConditionType(PHPExcel_Style_Conditional::CONDITION_CELLIS)
->setOperatorType(PHPExcel_Style_Conditional::OPERATOR_GREATERTHANOREQUAL)
->addCondition('0');
$objConditional3->getStyle()->getFont()->getColor()->setARGB(PHPExcel_Style_Color::COLOR_GREEN);
$conditionalStyles = $objPHPExcel->getActiveSheet()->getStyle('B2')->getConditionalStyles();
array_push($conditionalStyles, $objConditional3);
array_push($conditionalStyles, $objConditional1);
$objPHPExcel->getActiveSheet()->getStyle('B2')->setConditionalStyles($conditionalStyles);
Does any one know how to work around this ? am i doing anything wrong ?
Thanks.

As far as i know, though i have not tested with your case specifically, when you try to apply conditional formatting based on CONTAINSTEXT,
you shouldn't call
'->addCondition('X')'
(line 5 in your code), but instead call the method:
->setText('X')
On your PHPExcel_Style_Conditional objects. This is how I specify the text to compare to in my PHPExcel sheets.

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