View the errors in the GEDCOM using Reports ⟶ Error Report
Click on each section to see a breakdown of the errors.
In this example, we are viewing the list of relationship errors.
⟶ shows the generation chart which helps to visualize errors in relationships.
The lines in the chart represent family relationships. The context menu helps fix errors. Refresh the chart using Right Click ⟶ Refresh after making changes to relationships. Errors for persons on the current chart can be seen using Right Click ⟶ View ⟶ Chart Info (q) ⟶ Chart Errors