Server can't open log file

[Duke of Buckingham]

Trying to report PPS (Sieve) 1.39 (ati13ati).

12-03-2013 10:03:45 | PrimeGrid | Sending scheduler request: Requested by user.
12-03-2013 10:03:45 | PrimeGrid | Reporting 3 completed tasks
12-03-2013 10:03:45 | PrimeGrid | Not requesting tasks: "no new tasks" requested via Manager
12-03-2013 10:03:47 | PrimeGrid | Scheduler request completed
12-03-2013 10:03:47 | PrimeGrid | Server can't open log file (../log_www/scheduler.log)

Is this a problem in my computer or is a Primegrid server problem and is not only me?
What should I do?

[Duke of Buckingham]

I was in Primegrid forum and it is a server problem. So it was not only me.