Error message for creating new variable

[mantubiradar19]

I tried to run the following piece of code:

data ssd.Dur1dur2;
avg_pres_Y =(dur1_acei/(dur2_acei/365));
run;

anb I'm getting this error (Attached in the image) - can someone help me to solve this? 

[mohamed_zaki]

Check if the table viewer is open for your data sets?

If that is the case, then close it first and resubmit your code.

[mantubiradar19]

Thanks Mohamed! Let me try this!

[Reeza]

Your missing a SET statement.

[mantubiradar19]

Thanks ReezA!