Problems using Grails with Postgresql

i am using postgresql instead of mysql ,but while execute i am getting error
like

Caused by: org.codehaus.groovy.runtime.InvokerInvocationException:
org.springframework.dao.InvalidDataAccessResourceUsageException: could not
execute query; nested exception is
org.hibernate.exception.SQLGrammarException: could not execute query

my codings in datasource:

dataSource {
pooled = false

driverClassName = "org.postgresql.Driver"
username ="sa"
password =""
}
hibernate {
cache.use_second_level_cache=true
cache.use_query_cache=true

cache.provider_class='com.opensymphony.oscache.hibernate.OSCacheProvider'

}
// environment specific settings
environments {
development {
dataSource {

dbCreate = "update" // one of 'create', 'create-drop','update'
url ="jdbc:postgresql://localhost:5432/test"
}
}
test {
dataSource {
dbCreate = "update"
url = "jdbc:hsqldb:mem:testDb"

}
}
production {
dataSource {
dbCreate = "update"
url = "jdbc:hsqldb:file:prodDb;shutdown=true"

}
}
}
pls help me to execute
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