Cura is not able to load .stl files

[Korlimann 0]

Good evening everyone!

 

I made a Box for Magic the Gathering Cards in 123d Design and exported it using the "Fine" setting

When I tried to load it into Cura (3.4), I got this Error: 

2018-07-06 17:58:42,718 - ERROR - [Thread-3] UM.Logger.logException [85]: AssertionError: File too large, got 2015675263 triangles which exceeds the maximum of 10000000

I'm very confused, why the stl File has so much triangles, and how to reduce them. The line is from when I exported it, using the "Coarse" Settings, and even that was way too big. The file itself has about 2mb

I will attach a picture of the box and the stl file itself, hopefully someone can help me ?

 

Thanks a lot and have a nice day!

Box.stl