Loading Obj mesh with ofxassimpLoader failed

Hi everybody !
I would like to load a minimalist .obj file with ofxassetimpModelloader built during my sketch process
My .obj File is like this

v 50 50 0 v 974 50 0 v 974 718 0 v 50 718 0 f 1 2 3 4

and when I try a basic

objModel.loadModel(“myObjFile.obj”,false);

I get "
error ofxassimpmodelloader loadModel() validation failed aiScene::mNumMeshes is 0.At least one mesh must be there.
"

Any ideas ? Am i supposed to write vertex normals on my .obj file ?

Solved : I just need at least 2 faces in my .obj