Hi Sophiya,
To be able to help you, we need a lot more information actually: What did you deploy exactly?
Normally, logs can be seen in your admin console (which you can see in the devserver a couple of different ways, based off the language you're using and how you ran your devserver).
I would need an idea of what you deployed, how you deployed it, and what's in your logs (which you can access either through localhost:8000 if you're in python, or localhost:8080/_ah/admin if you're in Java).
Cheers!