Oracle Message TNS-00131 - Missing COMMUNITY in COMMUNITY_COST_LIST in TNSNET.ORA

ERRORMissing COMMUNITY in COMMUNITY_COST_LIST in TNSNET.ORA
CAUSEA COMMUNITY keyword-value pair is missing within the COMMUNITY_COST_LIST in TNSNET.ORA.
ACTIONDefine the communities with a COMMUNITY name and associated COST in COMMUNITY_COST_LIST.