Encountered the symbol when expecting one of the following: if in Pl/SQL function

I am writing the below function in which i am getting an error i think for if/else condition as Error(1360,5): PLS-00103: Encountered the symbol "BUILD_ALERT_EMAIL_BODY" when expecting one of the following: if. I think i am using proper syntax but dont know why the error is coming.

FUNCTION BUILD_ALERT_EMAIL_BODY
(
  IN_ALERT_LOGS_TIMESTAMP IN TIMESTAMP
, IN_ALERT_LOGS_LOG_DESC IN VARCHAR2
, IN_KPI_LOG_ID IN NUMBER
) RETURN VARCHAR2 AS
BODY VARCHAR2(4000) := '';
V_KPI_TYPE_ID NUMBER;
V_KPI_THRESHOLD_MIN_VALE NUMBER;
V_KPI_THRESHOLD_MAX_VALE NUMBER;
V_EXPECTED_VALE NUMBER;
V_ACTUAL_VALE NUMBER;  

BEGIN
-- ,'yyyy-MM-dd H24 mm ss'
Select KPI_DEF_ID INTO V_KPI_DEF_ID FROM KPI_LOGS WHERE KPI_LOG_ID = IN_KPI_LOG_ID;
Select EXPECTED_VALE INTO V_EXPECTED_VALE FROM KPI_LOGS WHERE KPI_LOG_ID = IN_KPI_LOG_ID;
Select ACTUAL_VALE INTO V_ACTUAL_VALE FROM KPI_LOGS WHERE KPI_LOG_ID = IN_KPI_LOG_ID;


  Select KT.KPI_TYPE_ID INTO V_KPI_TYPE_ID FROM RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION KD JOIN RATOR_MONITORING_CONFIGURATION.KPI_TYPE KT ON KD.KPI_TYPE = KT.KPI_TYPE_ID WHERE KD.KPI_DEF_ID = V_KPI_DEF_ID;
Select KPI_THRESHOLD_MIN_VAL INTO V_KPI_THRESHOLD_MIN_VALE FROM RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION WHERE KPI_DEF_ID = V_KPI_DEF_ID;
Select KPI_THRESHOLD_MAX_VAL INTO V_KPI_THRESHOLD_MAX_VALE FROM RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION WHERE KPI_DEF_ID = V_KPI_DEF_ID;

    IF ((V_KPI_TYPE_ID = 18) || (V_KPI_TYPE_ID = 19))  THEN
    BODY := BODY || 'KPI_THRESHOLD_MIN_VAL:' || V_KPI_THRESHOLD_MIN_VALE || Chr(13) || Chr(10);
    BODY := BODY || 'KPI_THRESHOLD_MAX_VAL:' || V_KPI_THRESHOLD_MAX_VALE || Chr(13) || Chr(10);
    ELSE IF ((V_KPI_TYPE_ID = 11) || (V_KPI_TYPE_ID = 12) || (V_KPI_TYPE_ID = 13) || (V_KPI_TYPE_ID = 14) || (V_KPI_TYPE_ID = 20)) THEN
    BODY := BODY || 'EXPECTED_VALE:' || V_EXPECTED_VALE || Chr(13) || Chr(10);
    BODY := BODY || 'ACTUAL_VALE:' || V_ACTUAL_VALE || Chr(13) || Chr(10);    
    END IF;

    RETURN BODY;
END BUILD_ALERT_EMAIL_BODY;

via Chebli Mohamed