i am trying to convert a kml file that i made on UMap website into shapes.txt using http://bdferris.github.io/kml-to-gtfs-shapes/ but it doesnt see anything in the map any special tools please ?
Yes, I reproduced this behaviour with a simple KML generated using umap.
The tool (http://bdferris.github.io/kml-to-gtfs-shapes/) will only convert polylines, as it states in the first sentence of the website:
This page provides a simple tool to generate a GTFS shapes.txt file from polyline entries in a KML file.
Polygons dont work and only produce the header line, polylines work and produce correct output.