Parameter outtmpl is bytes , but should be a unicode string. Put from __future__ import unicode_literals at the top of your code f ile or consider switching to Python 3.x.

[Jfeng3]

Just made a web app using youtube-dl python package
the app run perfectly on local mac os machine
when I deploy to aws elasticbeanstalk, ( which is linux machine ) . it gave the error

Parameter outtmpl is bytes , but should be a unicode string. Put  from __future__ import unicode_literals  at the top of your code file or consider switching to Python 3.x.

Any clue how to resolve this

[dstftw]

It's not an error but a warning in the first place. Did you even read the the text?! It clearly states that outtmpl must be unicode string not bytestring.