I was coding coding in Oracle, when I encounter an issue Declare and syntax, but I don’t know where is it

Error starting at line : 311 in command –

DECLARE
    v_commune_id NUMBER;
    v_district_id NUMBER;
BEGIN
    FOR stress IN (SELECT * FROM tbl_dm_stress) LOOP
        BEGIN
            -- Xác ??nh ID c?a District
            BEGIN
                SELECT ID INTO v_district_id
                FROM tbl_dm_district
                WHERE NAME = stress.DISTRICTS;
            EXCEPTION
                WHEN NO_DATA_FOUND THEN
                    INSERT INTO tbl_dm_district (NAME, ACTIVE)
                    VALUES (stress.DISTRICTS, 1)
                    RETURNING ID INTO v_district_id;
            END;
        END;

        BEGIN
            -- Xác ??nh ID c?a Commune v?i ?i?u ki?n theo tên District
            BEGIN
                SELECT ID INTO v_commune_id
                FROM tbl_dm_commune
                WHERE NAME = stress.COMMUNES
                AND ID_DISTRICT = v_district_id;
            EXCEPTION
                WHEN NO_DATA_FOUND THEN
                    INSERT INTO tbl_dm_commune (NAME, ACTIVE, ID_DISTRICT, ID_PROVINCE, CODE_COMMUNE_WEB)
                    VALUES (stress.COMMUNES, 1, v_district_id, NULL, NULL)
                    RETURNING ID INTO v_commune_id;
            END;
        END;

        -- Insert vào b?ng tbl_dm_stress_detail
        INSERT INTO tbl_dm_stress_detail (
            STRESS_ID, STRESS_NAME, COMMUNE_ID, COMMUNE_NAME, DISTRICT_ID, DISTRICT_NAME,
            ACTIVE, CREATE_DATE, CREATE_BY, LAST_UPDATE_DATE, LAST_UPDATE_BY
        )
        VALUES (
            stress.ID, stress.STRESS_NAME, v_commune_id, stress.COMMUNES, v_district_id, stress.DISTRICTS,
            1, SYSDATE, stress.CREATE_BY, SYSDATE, stress.LAST_UPDATE_BY
        );
    END LOOP;
END;
Error report -
ORA-06550: line 37, column 76:
PL/SQL: ORA-00904: "DISTRICT_NAME": invalid identifier
ORA-06550: line 36, column 9:
PL/SQL: SQL Statement ignored
06550. 00000 -  "line %s, column %s:n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:
``


Try run to code, exception 
Error starting at line : 311 in command -
DECLARE
    v_commune_id NUMBER;
    v_district_id NUMBER;

and

Error report
ORA-06550: line 37, column 76:
PL/SQL: ORA-00904: “DISTRICT_NAME”: invalid identifier
ORA-06550: line 36, column 9:
PL/SQL: SQL Statement ignored
06550. 00000 – “line %s, column %s:n%s”
*Cause: Usually a PL/SQL compilation error.