Cannot add pkcs11 module in Firefox

Mari Rosen <[email protected]> Wed, 29 Nov 2017 02:16:00 -0800 (PST)
Newsgroups gmane.comp.mozilla.security
Message-ID <[email protected]>
Hello,
I can't add 64-bit pkcs11 module in 64-bit Firefox with "modutil". Error is:
Probable cause : "error 193". 
Can anyone help?