Hi Suffi,
Tickstory does not create the symbol name in MT4 – you need to use a symbol that already exists in your broker terminal. If DAX doesn’t exist, you will need to use another symbol available in MT4 as a suitable “proxy” instrument. You can read more about mapping a symbol such as DAX to another by referring to this post:
viewtopic.php?f=4&t=435
Hope this helps.