The <from> and <version> directive is mandatory in your travis config

[abitrolly]

previs doesn't start.

✗ previs
You are using '.travis.yml' file
Creating Dockerfile
The <from> and <version> directive is mandatory in your travis config%          

What does that mean?

I am using snap beta: 0.4.1 (77) 3MB - <.

[PaulRosset]

Hey, thank's for your feedback.
This error report mean either you forgot to pass the language and the version of the language used or either you just passed the things in a manner that Previs don't understand.

[abitrolly]

Here is the .travis.yml - https://github.com/Multy-io/Multy-back/blob/fb4fa80244144444c28f258bd8711ff42bc504fd/.travis.yml - it is the same as in master right now, so you clone and run it yourself.

[PaulRosset]

I think you should read the readme and the wiki. Many things in your travis.yml is not yet supported by Previs.

[abitrolly]

I could write a patch for this specific message if I could understand where is comes from.