[Gdal-dev] ogr2ogr Unable to open datasource

[Ryan Ollerenshaw]

I keep getting the following error:

$ ogr2ogr -f "ESRI Shapefile" thick18.shp thick18_test.cvs
FAILURE:
Unable to open datasource `thick18_test.cvs' with the following drivers.
  -> ESRI Shapefile
  -> MapInfo File
  -> UK .NTF
  -> SDTS
  -> TIGER
  -> S57
  -> DGN
  -> VRT
  -> AVCBin
  -> REC
  -> Memory
  -> CSV
  -> GML
  -> PostgreSQL


My CSV file looks like this:
-180,90.00,0.00,4.84
-179,90.00,0.00,4.84
-178,90.00,0.00,4.84
-177,90.00,0.00,4.84
-176,90.00,0.00,4.84
-175,90.00,0.00,4.84

I am not sure why i am getting an unable to open datasource, any ideas 
on what i could be doing wrong would be much appreciated.

Thanks,
-Ryan