Strange tty messages in /var/log/messages

I have installed SuSE Linux 7.3 sparc on an Ultra 1. I get an endless
stream of discomforting messages in /var/log/messages. Can anyone here
tell me how to get rid of them?

Thanks in advance.

Best regards,
David List

Here is an example:

May 17 21:29:46 sol mingetty[606]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[604]: /dev/tty1: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[613]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[612]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[610]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[618]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[616]: /dev/tty1: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[619]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:46 sol mingetty[625]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[624]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[622]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[631]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[630]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[628]: /dev/tty1: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[637]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[636]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[634]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[642]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[640]: /dev/tty1: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[648]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[644]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[645]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[652]: /dev/tty1: cannot open tty: No such
device
May 17 21:29:47 sol mingetty[650]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:48 sol init: Id "1" respawning too fast: disabled for 5
minutes
May 17 21:29:48 sol mingetty[658]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[653]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[655]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[665]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[664]: /dev/tty2: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[659]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[661]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:48 sol init: Id "2" respawning too fast: disabled for 5
minutes
May 17 21:29:48 sol mingetty[668]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[670]: /dev/tty3: cannot open tty: No such
device
May 17 21:29:48 sol init: Id "3" respawning too fast: disabled for 5
minutes
May 17 21:29:48 sol mingetty[672]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[673]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:48 sol mingetty[678]: /dev/tty6: cannot open tty: No such
device
May 17 21:29:48 sol init: Id "6" respawning too fast: disabled for 5
minutes
May 17 21:29:49 sol mingetty[677]: /dev/tty4: cannot open tty: No such
device
May 17 21:29:49 sol init: Id "4" respawning too fast: disabled for 5
minutes
May 17 21:29:49 sol mingetty[676]: /dev/tty5: cannot open tty: No such
device
May 17 21:29:49 sol init: Id "5" respawning too fast: disabled for 5
minutes