Empty space being filled

2020-5-28 946

I am experiencing a problem that I am not really sure how to ask about. I have a simple cube with a hole straight through the middle but when i slice it, the program seems to fill in the negative space. Or what I assume is supposed to be negative space. I made the model in blender and exported it to .stl and then to chitu. Any suggestions? attached file i am using

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