Failed to change password. test test.com 123 -22

[Chris Chan]

hi, i install the qmailadmin on a solaris box. it work fine. recently i
install another copy for a new domain.

when i try to change the password of a pop account. it return an error:

"Failed to change password. test test.com 123 -22"

anyone know how to fix it? anyone know what changes of the system will
caused this problem?

P.S.
I use the lastest version of qmailadmin and vpopmail.

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  Chris Chan