Not sure if this is the right place but I have a backup/restore error message

Hi,

I created a backup with BackupBuddy and imported it into Desktopserver. Usually this gives me no problems at all with my client sites, but now I am running into an issue.

I get this warning at the top of my page:

Warning: session_start(): open(\xampplite\tmp\sess_3qegcgp126lvm4fbp6u58d3ar7, O_RDWR) failed: No such file or directory (2) in D:\DesktopServerwebsites\www.mysite.dev\wp-content\themes\mysite\config-templatebuilder\avia-shortcodes\masonry_entries.php on line 32

I am not sure what it means. Just to be sure I took the theme files from my server and copied them to the themes file inside the local installation. But that didn’t change anything.

Can anyone shed any light on what the message means and what I can do?

My site seems to function okay except that I am missing the text on the blue background

http://kriesi.at/themes/enfold-business-flat/
(Howdy Guys! ….)

and I used the sticky menu and when I scroll down it shows a gap above it.