Cannot import the following key file: ivandrofly.pfx. The key file may be password protected

[marcello-pietrobon]

Hello,
when I compile the plugins the only one that is not compiling is LinesUnbreaker with the following error message:

error MSB3325: Cannot import the following key file: ivandrofly.pfx. The key file may be password protected. To correct this, try to import the certificate again or manually install the certificate to the Strong Name CSP with the following key container name: VS_KEY_537AA93A7A83BF8C

error MSB3321: Importing key file "ivandrofly.pfx" was canceled.

I tried to fix it but it seems I need a password. What should I do?

Thanks,
Marcello