'Unable to parse Public Key'

Hello,

I’ve got a Problem with this beta. I’d installed the SimpleSecure Plug-In. I filled in my Public Key in the Settings. Now I would test it and I get allways this eroor (https://www.teleschirm.info/blog/kontakt/):
An error occured: ‘Unable to parse Public Key’ Please use the back button to return to the previous page.

How can I fix it?

Thanks for this amazing Plug In!

https://www.ads-software.com/plugins/simplesecure/