I cannot blend or fillet the highlighted edges properly. Please help. I have attached the file as well.formula12.3dm (2.3 MB)
Looks like you are trying to fillet or blend with a “radius” of 0.01. However the tolerance (DocumentProperties > Units) is 0.01. The fillet/blend radius should be at least 10 times the tolerance. Either increase the radius or decrease the tolerance. Decreasing the tolerance may require some rebuilding of the geometry.
Edit: You could also change the units to something smaller than feet, such as inches or millimeters, while keeping the tolerance as 0.01. However that may also require some rebuilding of the geometry, particularly any trimmed surfaces and joins.