Oracle Message PGA-21005 - no message file found for language string

ERRORno message file found for language string
CAUSEThere was no message file available for the language specified by the NLS_LANG environment variable.
ACTIONRefer to Appendix J, National Language Support, for a list of message file languages supported by the RRM. If the language required is supported, ensure that the ORACLE_HOME environment variable specifies the gateways home directory and that the message files are properly installed.