As it was ask yesterday on the french user group, I rewrite it here ...

When importing documents in a specific area with the parameter /area, you have to provide the logical relative path to the existing area.

Explanation : I want to import in myserver>area1>area1child1, I specify "area1/area1child1" and not "http://myserver/area1/area1child1" (that could be logical) or "http://myserver/C3/area1child1" (that is the browser url of the area).

Enjoy !