There is error to import STL file format

Hello dear all.
After importing STL file format, there is an error, could u please help me?
Best Regard

It seems, as the error message says, that there are some overlapping surfaces in your structure that is causing this problem. Without seeing your structures, it would be difficult to tell exactly where the problem might lie, but merging any overlapping surfaces during STL export in your CAD software might help.
You might want to take a look at the following post for further information about generating valid STL file for import.

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