[postgis-users] ERROR: Unable to identify an operator '&&'....

[Barbara Olga Kastelliz]

hello,
i have installed postgresql 7.3.1 and postgis 0.7.3 on windows 2000, but when
trying the commands from the postgis.readme file i get the
following error messages:

dbte=# SELECT * from test WHERE geom && 'BOX3D(2 2 0,3 3 0)'::box3d;
cERROR: Unable to identify an operator '&&' for types 'geometry' and 'box3d'
You will habe to retype this query using an explizit cast
ERROR: Unable to identify an operator '&&' for types 'geometry' and 'box3d'
You will habe to retype this query using an explizit cast
dbte=#

the same error occurs when i use ::geometry instead of ::box3d.

what's wrong?
should i use an earlier postgres version?
(i wouldn't be really fond of compiling postgres again).
or another postgis.sql?

any advice would be very much appreciated, 
thanks in advance
barbara kastelliz