Attempted to call an undefined method named "getRootNode"

[hrodriguez758]

Looks like the current version is not compatible with Symfony 3.4.*

I try to use the last version and I'm getting this error

Uncaught Symfony\Component\Debug\Exception\UndefinedMethodException: Attempted to call an und
  efined method named "getRootNode" of class "Symfony\Component\Config\Definition\Builder\TreeBuilder"

when I try to change the version to 1.2 according to the documentation but I'm getting another error.

Any solution for that?

[hrodriguez758]

Any updates?