A few hints/ideas:
- cron runs as its own user with its own ENV, so $PATH etc differs from other users
- try running it in cron as your own user (kullanici)
- cd into your homedir before trying to start the bot since it seems unable to find modules ("No module named Trading")
- set the directory for the modules (PYTHONPATH or sys.path.append)

If you know someone who is good with Linux, let him have a look directly at your system. It's hard to debug something if you cannot do anything yourself.
Only let that do someone you really trust and look over his shoulder to see what he is doing at any time.