Cause:
When internally checking whether a path can be blended, conditions that do not permit blending trigger this error, such as an unsuitable path point type, switching between fixed and non-fixed tools, or switching between coordinated and non-coordinated coordinate-system points.
Troubleshooting:
Check the line number indicated in the error message and whether the preceding and following lines have any of the above conditions that do not satisfy blending.
If so, manually disable blending first, back up the system, and report a software defect.
Solution:
Modify the blending conditions. Manually disable blending for statements that do not meet the blending conditions to avoid errors. Also back up the system and submit a software defect report.