Ruseel Branca goes through a list of Erlang versions to identify those that are safe to be used with CouchDB:
There has been some discussion on what versions of Erlang CouchDB should
support, and what versions of Erlang are detrimental to use. Sadly there
were some pretty substantial problems in the R15 line and even parts of R16
that are landmines for CouchDB. This post will describe the current state of
things and make some potential recommendations on approach.
Original title and link: What versions of Erlang should you use with CouchDB