caught runtime exception: No such file or directory

Hi@all! This morning I have installed spamprobe 1.4b from source code onto a
very old RedHat system. Source compilation has been completed without errors,
but when I launch spamprobe it said: 

ibox:~$ spamprobe spam Maildir/Spam (maildir format)
caught runtime exception: No such file or directory

or

ibox~$ spamprobe good Mail/mbox (mailbox format)
caught runtime exception: No such file or directory

How can I solved this?

Andrea-

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