The child row may reference a parent SKU that is blank, misspelled, or missing from the pasted file.
Add or correct the parent row, keep parent SKUs exact, and rerun the checker before uploading the variation family.
Two child rows can share the same color, size, or variation option under one parent.
Keep one row for each option combination and change or remove accidental duplicates.
Parent rows should usually describe the family, while price, quantity, and sellable identifiers belong on child rows.
Move sellable values to child rows and keep parent rows focused on the relationship fields required by Amazon.