Error: Running the Spatial Analyst interpolation functions IDW, Spline, or Kriging returns 'An invalid field name was used' error
This error occurs when running the Spatial Analyst interpolation functions IDW, Spline, or Kriging:
"An invalid field name was used"
The attribute table of the input data should contain at least one numeric field. When this is not the case, the term <value> appears in the Z value field dropdown list.
Solution or Workaround
If the data is available, create and populate a numeric item in the input dataset.