incompatible encoding regexp match (ASCII-8BIT regexp with UTF-8 string)

[nanooq]

This happens when polling and exists sup:

[2014-12-23 16:19:03 +0000] WARNING: DL is deprecated, please use Fiddle
[2014-12-23 16:19:29 +0000] ERROR: oh crap, an exception
----------------------------------------------------------------
We are very sorry. It seems that an error occurred in Sup. Please
accept our sincere apologies. Please submit the contents of
/home/lora/.sup/exception-log.txt and a brief report of the
circumstances to https://github.com/sup-heliotrope/sup/issues so that
we might address this problem. Thank you!

Sincerely,
The Sup Developers
----------------------------------------------------------------
--- Encoding::CompatibilityError from thread: poll after loading inbox
incompatible encoding regexp match (ASCII-8BIT regexp with UTF-8 string)
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/header.rb:81:in `=~'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/header.rb:81:in `parse'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:233:in `block in parse_header'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:229:in `each'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:229:in `parse_header'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:194:in `parse_low'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:183:in `parse'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:331:in `parse'
/home/lora/.rvm/gems/ruby-2.1.5/gems/rmail-sup-1.0.1/lib/rmail/parser.rb:345:in `read'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:489:in `message_to_chunks'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:470:in `block in message_to_chunks'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:470:in `map'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:470:in `message_to_chunks'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:265:in `load_from_source!'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/message.rb:370:in `build_from_source'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:204:in `block in poll_from'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/maildir.rb:161:in `block in poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/maildir.rb:160:in `each'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/maildir.rb:160:in `each_with_index'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/maildir.rb:160:in `poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:201:in `poll_from'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:146:in `block (2 levels) in do_poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:136:in `each'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:136:in `block in do_poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:135:in `synchronize'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:135:in `do_poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/util.rb:658:in `method_missing'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/modes/poll_mode.rb:15:in `poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:58:in `poll_with_sources'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/poll.rb:94:in `poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup/util.rb:658:in `method_missing'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/bin/sup:222:in `block (2 levels) in <module:Redwood>'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup.rb:88:in `block in reporting_thread'

$ which sup
/home/lora/.rvm/gems/ruby-2.1.5/bin/sup

In order to prove my suspicion, that this is related to polling, I started sup once more and initiated polling. I got the same error and these additional lines:

--- NoMethodError from thread: user-invoked poll
undefined method `poll' for nil:NilClass
(eval):1:in `poll'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/bin/sup:328:in `block in <module:Redwood>'
/home/lora/.rvm/gems/ruby-2.1.5/gems/sup-0.20.0/lib/sup.rb:88:in `block in reporting_thread'

[gauteh]

You might bypass the problem by setting LC_ALL=C. This appears to be a duplicate of #205.

[nanooq]

If I run
$: LC_ALL=C sup
polling is successful, but my keybinding does not accept arrow-keys anymore and takes them for 'help'

[gauteh]

Yes, it is not a permanent solution. But it gets you past the message. If you change back your locale and you need to open it again or receive a message with a similar problem you will get problems again.