[postgis-users] Meaning of "Unable to count the values for band at index 1"

[Pierre Racine]

Hi,

I do this query for counting the frequency of values in a raster:

SELECT identifian, ST_ValueCount(ST_Clip(rast, geom)) As pvc
FROM raster400x400_out, zones
WHERE ST_Intersects(rast, geom)

and I get many message like:

"Unable to count the values for band at index 1"

What does that mean?

Thanks,

Pierre