Cleaning Cach cause errors

When ever i have to clean cach ALL or db cach ...

And i click on Profile or even on a member username i got this error :

Warning: Invalid argument supplied for foreach() in /home/xxxxx/public_html/www.xxxxxx.com/inc/classes/BxDolProfileFields.php on line 629

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxxx/public_html/www.xxxxxxxx.com/inc/classes/BxDolProfileFields.php:629) in /home/xxxxx/public_html/www.xxxxxx.com/inc/design.inc.php on line 133

So to make this error disappear i have to change the template to another one then back again to that template this make the error disappear but why i have to do that !

This error happen in the UNi template !

Cannot modify header information - headers already sent.

This warning is almost always caused by extra white space or new lines at the end of the scripts.

Open each php file mentioned. There are 2 of them. Go to the end of the file and remove any blank lines after the final closing ?> php tag.

Most servers do not have a problem with blank lines. Mine does not. But some do.

Go into your Admin Panel > Settings > Advance Settings > Other

Remove the checkmarks from Enable DB Cache AND Enable page block cache if they are checked

Try to view your profile page again.

Thank you guy's for your help , i will try the both solution :)

Check if the memcached are installed on your server

This is related to this ticket: http://www.boonex.com/trac/dolphin/ticket/2214

The fix: http://www.boonex.com/trac/dolphin/changeset/14511

Clean cache after applying the fix.