If Then Do produces Unclosed Do loop error message

I have the following code, but if you notice the "END;" is in red as if there is a statement missing. And when I run this I get an error message "ERROR 180-322: Statement is not valid or it is used out of proper order."

Here is my code:

DATA _NULL_;
SET TEST;
IF FIRST.RECNO ^= 0 THEN DO;
    PROC SORT DATA=TEST OUT=TEMP;
    BY DESCENDING RECNO;
    RUN;
    DATA DATASET2;
        SET TEMP;
        BY RECNO;
        IF FIRST.RECNO;
    RUN;
END;    
RUN;