raster2pgsql: Strange error when creating a table

From the PostGIS webpage :

-- enable raster support (for 3+)
CREATE EXTENSION postgis_raster;

When you create a Postgis template database via loading and executing the sql scripts: postgis.sql and spatial_ref_sys.sql, you create the basic postgis template. This adds the spatial functions, reference systems, geometry data types, but not the raster datatype. To add that, you have to load and execute another script: rtpostgis.sql which is located next to the other 2 files. On linux thats in /usr/share/postgresql/9.1/contrib/postgis-2.0.1/rtpostgis.sql