Boundary calculation failed or boundary too small to produce a toolpath.

This can be caused by duplicate entities in the boundary, boundary self intersection or boundary is too small for the tool.
View the solution in the Autodesk article located here:
https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Boundary-calculation-failed-or-boundary-too-small-to-produce-a-toolpath-when-calculating-toolpath-in-PowerMill.html
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