headers already sent?

PHP Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosweb/web151/b1519/ipg.awaliartcom/shop/admin/index.php:83) in /hermes/bosweb/web151/b1519/ipg.awaliartcom/shop/vqmod/vqcache/vq2

Not sure what this error means but whenever I see it, one or more of the product Size Options that I've enabled disappear from the product store front and in the backend/admin section and I have to re-list them. This happens each time I go back into a product listing to edit any aspect of the item.

I see it has something to do with Vqmod, but I am at a loss. Anyone else have this issue? OC 1.5.1.3.1

TechSitement wrote:PHP Warning: Cannot modify header information

This might be that one of your vqmods is adding to blank lines/extra space to the file it is modifying. Try using <add trim="true">

marvmen21 wrote:

TechSitement wrote:PHP Warning: Cannot modify header information

This might be that one of your vqmods is adding to blank lines/extra space to the file it is modifying. Try using <add trim="true">

Thanks marvmen21! Where should that code be added?

I don't know this for sure but it seems like you'd edit the xml files in vqmod/xml/*.xml and search for "add" and replace with "add trim="true"" for lines where it adds a lot of stuff. Empty lines don't need trim I guess.

Yea, actually add=trim true won't help much in this case I've realized. Please clean your error logs and then go where you are getting the error, check your error log and paste here the complete error to see if we can get an idea of what is happening. Most of the times, a single space before the opening <?php in one of your language files would be the culprit.