Need some quick Magento help

I have a Magento store and for some unknown reason, it has suddenly started throwing a "headers already sent" error. I added some items to the store last week and set up a coupon and everything worked fine. Today I set up another coupon and when I went to check the coupon, I started getting this error.

The store works just fine, up to the point that you go to add something to your basket. Then you get the error submission screen below. If you go back a page, the order page will reload and if you look up in the cart line you will see that the item has been added to your cart. If you go to your cart, there it is and the coupon works just fine. It's just when you adding any item to your cart that this screen comes up.

Conventional wisdom (Google) says that this is a php error and that there is probably a blank space in the referenced file. I have looked, downloaded into Emeditor and saved UTF-8 but the problem remains.

I did not open or make any changes to the referenced file when I was adding items to the store last week. It's a live store and I need to solve this asap.

Appreciate hearing from anyone that has the time and skill to make this right in the next couple of hours.

thanks,

yourtd

The error looks like this:

Cannot send headers; headers already sent in /home/xxxxxxxx/www/www/app/code/core/Mage/Catalog/Model/Resource/Eav/Mysql4/Product/[login to view URL], line 1

Trace:

#0 /home/ebband/www/www/lib/Zend/Controller/Response/[login to view URL](147): Zend_Controller_Response_Abstract->canSendHeaders(true)

#1 /home/ebband/www/www/app/code/core/Mage/Core/Controller/Varien/[login to view URL](518): Zend_Controller_Response_Abstract->setRedirect('http://www.ebba...')

#2 /home/ebband/www/www/app/code/core/Mage/Checkout/controllers/[login to view URL](78): Mage_Core_Controller_Varien_Action->_redirect('checkout/cart')

#3 /home/ebband/www/www/app/code/core/Mage/Checkout/controllers/[login to view URL](198): Mage_Checkout_CartController->_goBack()

#4 /home/ebband/www/www/app/code/core/Mage/Core/Controller/Varien/[login to view URL](367): Mage_Checkout_CartController->addAction()

#5 /home/ebband/www/www/app/code/core/Mage/Core/Controller/Varien/Router/[login to view URL](247): Mage_Core_Controller_Varien_Action->dispatch('add')

#6 /home/ebband/www/www/app/code/community/ArtsOnIT/OfflineMaintenance/Controller/Router/[login to view URL](46): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))

#7 /home/ebband/www/www/app/code/core/Mage/Core/Controller/Varien/[login to view URL](158): ArtsOnIT_OfflineMaintenance_Controller_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))

#8 /home/ebband/www/www/app/[login to view URL](457): Mage_Core_Controller_Varien_Front->dispatch()

#9 /home/ebband/www/www/index.php.(52): Mage::run()

#10 {main}

I don't know if it makes any difference, but I also meant to mention that the error page shows up in the window of Magento Demo store. I'm not sure if all errors show in a Demo store window or if this has something to do with the problem.

yourtd

Magento PHP

Ταυτότητα Εργασίας: #784306

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