If the name or location of the source file for a referenced text inset changes, the text inset is marked as unresolved in the Insets panel.
To fix unresolved text insets:
If you open a document that contains unresolved insets, you are prompted to fix the errors.
Choose to the open the Insets panel. Filter the list of insets to display only the unresolved insets.
Figure 1. Filter to view unresolved insets
Select each unresolved inset and click Go to Location.
The unresolved text inset in the document is selected.
Check the properties of the existing (unresolved) inset from the properties displayed in the list.
For more details on the inset click Properties to open the Text Inset Properties dialog.
Re-import the text inset into the document.