[mapguide-users] ExecuteSqlQuery Not Working

[flakesns]

I got problem here.

here is my code (php):

$layerFeatureResource = new MgResourceIdentifier($layerFeatureId);

$sql = "select road_name from roadTable where featId = 2";
$sqlDataReader = $featureService->ExecuteSqlQuery($layerFeatureResource,
$sql);

It's return me : 

"The requested operation is invalid.

The requested operation is invalid. Exception occurred in method
MgServerSqlCommand."

I use connection to shp folder and data store in dbf file.

Whats the problem exactly?
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