magento checkout billing save returns error

Question

i'm working with a magento website, when i fill the billing info on checkout and click on continute button. the save billing ajax response give this error

<br />
<b>Fatal error</b>:  Class 'Mage_Chunit_Helper_Data' not found in <b>/home/boutique/public_html/app/Mage.php</b> on line <b>516</b><br />

so i cannot go to the next step.in the system log i can see this

 2014-01-16T13:44:48+00:00 ERR (3): Warning: include(Mage/Chunit/Helper/Data.php): failed to open stream: No such file or directory  in 
    /home/boutique/public_html/lib/Varien/Autoload.php on line 93
    2014-01-16T13:44:48+00:00 ERR (3): Warning: include(Mage/Chunit/Helper/Data.php): failed to open stream: No such file or directory  in 
    /home/boutique/public_html/lib/Varien/Autoload.php on line 93
    2014-01-16T13:44:48+00:00 ERR (3): Warning: include(): Failed opening 'Mage/Chunit/Helper/Data.php' for inclusion (include_path='/home/boutique/public_html/app/code/local:/home/boutique/public_html/app/code/
community:/home/boutique/public_html/app/code/core:/home/boutique/public_html/lib:.:/usr/lib/php:/usr/local/lib/php')  in /home/boutique/public_html/lib/Varien/Autoload.php on line 93

i disabled the all extension from admin and check but no luck, can anyone know how to find a solution for this issue Thank You

Answer 1

The problem is you have disabled all extensions. Your code is asking for a helper from the Chunit extension which can't be found due to the fact that most likely that module is disabled.

You can try enabling your modules and also check if you have a Chunit helper file in

app/code/[community/local]/[Companyname]/Chunit/Helper/Data.php