Running latest docker installation on digital ocean. I had to change mail setup in app.yml after the change I ran:
./launcher rebuild app
The error received:
(<unknown>): found a tab character that violate intendation while scanning a plain scalar at line 67 column 13 -e LANG=en_US.UTF-8 YAML syntax error. Please check your /var/docker/containers/*.yml config files.
The site went down and it was easily fixed with:
./launcher start app
but my app.yml was not updated with new mail configuration. I have manually changed/translated some strings in serveren.yml and I am assuming this was the main problem for this error.