Warning: Cannot modify header information

Hello there,

I have just tried to upgrade OpenCart from v1.5.6.4 to v2.0.1.1
I printed out all the instructions and transferred the files on top of the current install. I did a new vQmod install as well and when tested it stated vQmod was already installed. However, when I went to my website it was full of lists of files and when I added install after my url they went away. I then had a message that It was upgraded with a "continue" button. As soon as I clicked continue I received the following error message and reported it as per instructed.

Notice: Error: Can't DROP 'option_value'; check that column/key exists
Error No: 1091
ALTER TABLE `oc_product_option` DROP `option_value` in /home/wwwclickmyoffer/public_html/system/library/db/mysqli.php on line 40

Warning: Cannot modify header information - headers already sent by (output started at /home/wwwclickmyoffer/public_html/system/library/db/mysqli.php:40) in /home/wwwclickmyoffer/public_html/system/library/response.php on line 12

Thanks for your reply

Dave

I believe there is NO working upgradescript to go to 2.0.

So I would advice you to stay with your current version.