Not able to release module

[Sudarshan]

hi
I have installed cvs on my linux machine.
I am accessing my repository through wincvs1.11
i am able to checkout , do the changes and modify the files and able
to commit the changes also

But when i want to release the checkedout module it gives me an error saying that

cvs release .(in directory D:\projects\project1)
cvs update: cannot find passowrd
cvs[update aborted]: use "cvs login" to log in first
cvs release: Unable to release '.'

PLS GIVE ME THE SOLUTION
 

Thanks for all

regards
Sudarshan