It's not obvious what's causing this. A bit more information might help.
Which version of svManager are you using (it's on the admin page)?
Have you installed the svManager server compatibility test?
What type of gallery are you using (SimpleViewer, TiltViewer, etc)?
Have the messages been there since you first installed svManager or did it suddenly start happening?
Do you feel happy to do a small edit in one of the files to switch the error reporting into debug mode? You'd need to edit the svmanager/includes/constants.php file and change one line.
Change this to:
This should produce a longer and more informative error message that you can post here. Change the debug setting back again afterwards.
SimpleViewer Support Team.