ASCII Error

You’ll need to provide more details than that. What OpenPGP client are you using? (Mailvelope?) What version? What browser? Etc.

Please read https://www.noverse.com/blog/2012/06/how-to-write-a-good-bug-report/ before replying.

It looks like there is a compatibility problem between several OpenPGP implementations. This is being tracked for WP PGP Encrypted Emails users on GitHub, so I’m marking this resolved for now and will eventually release an update that fixes this issue once the fixes are upstreamed to the libraries being used.