Converting Raster to Inroads DTM

I got a DEM in raster format from ArcGIS and tried to convert to inroads DTM by following Tools> Data Acquisition. I picked the correct projection and exported to inroads DTM.

When i bring the DTM in and try to draw contours, it prompts to triangulate the surface and this is the error it gives me:

The exterior boundary is crossing itself.

How can i fix this?

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