OTR query messages with|without HTML formatting

I'm using Tor Messenger 0.2.0b2 on macOS Sierra 10.12.

I've gotten the same error, but sometimes, it displays as:

" has requested an Off-the Record private conversation. However, you do not have a plugin to support that. See http://otr.cypherpunks.ca/ for more information."

And other times, it displays as (I see the HTML formatting as plaintext):

" has requested an Off-the-Record private conversation. However, you do not have a plugin to support that. See https://otr.cypherpunks.ca/; for more information."