Warning 000117 when clipping

Discussion created by apunivp1 on Jan 31, 2014
Latest reply on Feb 3, 2014 by apunivp1

I am trying to clip two vector layers (the main goal is : I have a shapefile with all the protected areas in EU so polygons, another with tracks so polylines and I am trying to clip the first one on the second one to get only the portions of the tracks that are in protected areas).
     - I projected them in the same projection (lambert conformal conic) using the project tool (and not the ''define projection''),
     - At first they did not have the same extent so I reprojected one within the extent of the other and now it is more or less the same one.
     - All the data sources of the two layers are now the same.
     - But for some reason when I try to clip my two layers I get the warning 000117 and an empty layer. The thing is that it works for one of the track layer with few objects on it but not for the one I need to use and I don't see where the problem is.

Any help would be great !! Thanks a lot,