Check your public key, probably missing a or some characters. In the link that you provided, I was able to use people's public key to encrypt message, but I was unable to use yours. Or try and encrypt a message with it to know if the public key is valid or not. If I am not right, let me know.
I am wondering what you are using if it's the easy one like igolder when it was active or the one that mdayonliner translated to English. Well, I would prefer to use the easy one for a certain reason (quite sick a few days and just recovered) and I haven't looked for one that I can use easily just by pasting the public key of OP and encrypt whatever message I'd like to encrypt. If you know any feel free to share but if it is not allowed by BGC then it's fine by me.