Unable to change tty /dev/tty1

[Mr. Suhas Ghosh]

Hi All,
I am using Debian Sarge 2.4.27. My root file system is read only.
Now after login I am getting a error like this:
Unable to change tty /dev/tty1 : Read Only file System.
Though it successfully login.
Can you please suggest me how to get relief from this message.
Is it very harmful to system
Thanks in advance.
Suhas