problems to sign emails

[Dirk Fettke]

hello,

my problem is, that i can't sign any emails i want to send. i'm using kmail 
with suse 8.2. if i klick on "send", i get an error-message called that i 
have given a wrong password. if i klick on "try again" the error comes again 
immediatelly. i can't type in any password. 
when i edit my gpg-key and type in no password, then the signing of emails 
works. only if i typeing a password in the gpg-key, then it won't working. 
what's the problem, or what i doing wrong?

tanks for your help

dirk fettke