Plugin Author
Meitar
(@meitar)
Sorry you’ve hit this issue. You’ve got it particularly bad because you hit two unrelated but known issues.
The first (the warning on activation) is thankfully harmless and can be ignored. It’s been reported already and has already fixed in development but hasn’t been released because the bug is minor (it doesn’t actually effect the functioning of the plugin, it’s just a bad experience on activation). So, you can safely ignore that one.
The other issue, however, is a known problem with the way some web servers configure PHP sessions and requires you (or your web hosting provider/server admin) to modify the PHP session_save_path runtime variable. The issue was debugged by the community in this other thread, which includes a number of possible solutions, one of which will work, depending on your hosting provider’s setup. Unfortunately I can’t tell you exactly what to do because, again, the specific steps are dependant on your hosting provider’s setup. The bottom line, though, is that your PHP session_save_path needs to be writable by your web server’s user. If that sounds like Greek to you, tell your web hosting provider to look at the thread I linked earlier in this paragraph and to implement the appropriate solution.
Hope this helps!