Database Error

ERROR [HY000] [Oracle][ODBC][Ora]ORA-12516: TNS:listener could not find available handler with matching protocol stack

ERROR [IM006] [Microsoft][ODBC Driver Manager] Driver's SQLSetConnectAttr failed
ERROR [HY000] [Oracle][ODBC][Ora]ORA-12516: TNS:listener could not find available handler with matching protocol stack