undefined function erlang:get_stacktrace

[toobr]

Following the Getting started guide, I get an error at the console.

exception error: undefined function erlang:get_stacktrace/0       in function  cowboy_stream_h:request_process/3 (src/cowboy_stream_h.erl, line 286)

It sends the response fine though.

Also some odd build time messages

*WARNING* public_key: Source code not found: 'OTP-PUB-KEY'.erl
*WARNING* public_key: Source code not found: 'PKCS-FRAME'.erlrelease