[pgrouting-users] assign_vertex_id error

[Annu Anurag]

Dear everybody. I tried the tutorial on the site recommended to set up the
network topology. There was a need to include the routing_topology.sql
definitions into the database. I did that. But I'm stuck at this error now:

VSDelhidb=# SELECT assign_vertex_id('roads_line', 0.0002, 'the_geom',
'gid');
NOTICE:  CREATE TABLE will create implicit sequence "vertices_tmp_id_seq"
for serial column "vertices_tmp.id"
CONTEXT:  SQL statement "CREATE TABLE vertices_tmp (id serial)"
PL/pgSQL function "assign_vertex_id" line 15 at EXECUTE statement
ERROR:  query string argument of EXECUTE is null
CONTEXT:  PL/pgSQL function "assign_vertex_id" line 36 at EXECUTE statement


Sadly, I'm not able to debug this error. Please help me here.
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