Fejl under start af apache?

Når jeg prøver at starte apache, så står den bare med dos og siger running....

Til sidst lukker jeg det, kigger i error.log, og der står følgende.

[Thu Oct 14 20:22:20 2004] [warn] (2)No such file or directory: exec() may not be safe
[Thu Oct 14 20:22:20 2004] [warn] (2)No such file or directory: exec() may not be safe
[Thu Oct 14 20:22:20 2004] [warn] exec() may not be safe
[Thu Oct 14 20:22:20 2004] [warn] exec() may not be safe
[Thu Oct 14 20:22:20 2004] [error] (12)Not enough space: create_thread rc = 12
[Thu Oct 14 20:22:47 2004] file .\main\http_main.c, line 6592, assertion "(rv >= 0) && (rv < nthreads)" failed
Apache server shutdown initiated...



Linjen
[Thu Oct 14 20:22:20 2004] [error] (12)Not enough space: create_thread rc = 12

Står MANGE gange

Hvad kan fejlen være?