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I am trying to test if pgrouting works fine or not. To do so I have created a table containing the following attributes.

Columns:
gid | length | the_geom | source | target

Now my problem is that when I try to execute the assign_vertex_id function it is giving me the following error;

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 32 at EXECUTE statement

*** Error ***

ERROR: query string argument of EXECUTE is null SQL state: 22004

Any suggestions what does this mean? Context: PL/pgSQL function "assign_vertex_id" line 32 at EXECUTE statement

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How does your query look like? –  dkastl Sep 8 '12 at 0:26
    
Assign_vertex_id(‘way’, 0.00001, ‘the_geom’, ‘gid’) –  Ryan Sep 8 '12 at 7:25
    
Oops, sorry my another answer's description was wrong. If you use assign_vertex_id function, use PostGIS v1.5.x because of another MultilineString issue. –  sanak Sep 12 '12 at 14:38

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