centos6 :: ERROR: encoding UTF8 does not match locale en_US.iso885915

Hi! I try to install opennms but i encountered this error:
Exception in thread "main" org.opennms.core.schema.MigrationException:
an error occurred creating the OpenNMS database
        at
org.opennms.core.schema.Migrator.createDatabase(Migrator.java:428)
        at
org.opennms.core.schema.Migrator.prepareDatabase(Migrator.java:444)
        at org.opennms.install.Installer.install(Installer.java:236)
        at org.opennms.install.Installer.main(Installer.java:949)
Caused by: org.postgresql.util.PSQLException: ERROR: encoding UTF8 does
not match locale en_US.iso885915
  Detail: The chosen LC_CTYPE setting requires encoding LATIN9.
        at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
        at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
        at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:374)
        at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:366)
        at
org.opennms.core.schema.Migrator.createDatabase(Migrator.java:425)
        ... 3 more

i have the following locale :
[root@monitor /]# locale
LANG=en_US.utf-8
LC_CTYPE="en_US.utf-8"
LC_NUMERIC="en_US.utf-8"
LC_TIME="en_US.utf-8"
LC_COLLATE="en_US.utf-8"
LC_MONETARY="en_US.utf-8"
LC_MESSAGES="en_US.utf-8"
LC_PAPER="en_US.utf-8"
LC_NAME="en_US.utf-8"
LC_ADDRESS="en_US.utf-8"
LC_TELEPHONE="en_US.utf-8"
LC_MEASUREMENT="en_US.utf-8"
LC_IDENTIFICATION="en_US.utf-8"
LC_ALL=en_US.utf-8

Any idea about the problem and solution?
Thanks!
Adrian

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