How to find contours in image using evision and nx?

I have ran “export EVISION_PREFER_PRECOMPILED=false” to set environment variable and deleted _bulid file for mix compile but every time I get this error

== Compilation error in file lib/smartcell/ml_traindata.ex ==
** (CompileError) lib/smartcell/ml_traindata.ex:3: module Kino.JS is not loaded and could not be found. This may be happening because the module you are trying to load directly or indirectly depends on the current module
(elixir 1.13.4) expanding macro: Kernel.use/2
lib/smartcell/ml_traindata.ex:3: Evision.SmartCell.ML.TrainData (module)
(elixir 1.13.4) expanding macro: Kernel.if/2
lib/smartcell/ml_traindata.ex:2: Evision.SmartCell.ML.TrainData (module)