Fixes / Word · Checked September 30, 2026

Word "Error! Reference source not found": causes and fixes

Short answer

Word shows "Error! Reference source not found." when a cross-reference points to a heading, caption, numbered item or bookmark that is no longer in the document. It often shows up after printing or saving to PDF, because those steps refresh fields. To fix it, right-click each error and delete it, or insert the cross-reference again so it points to the right target.

What this message means

A cross-reference in Word (text like "see Figure 3" or "see Section 2.1") is a field that is tied to a hidden bookmark on its target. When that target is deleted, retyped or replaced, the bookmark is gone. The next time Word updates the field, it replaces the old text with "Error! Reference source not found." The document is not damaged. Only that one link is broken. Updates happen when you press F9, print, save as PDF or open the print preview. That is why a document can look fine on screen and then show the error in the printout or PDF.

Common causes

Cause	How to tell
The heading, caption or numbered paragraph the cross-reference pointed to was deleted or retyped.	The error shows only in some spots. Go to References > Cross-reference (Windows) or Insert > Cross-reference (Mac) and look through the list: the item you expected is missing or has different text.
Fields were updated during printing or PDF export, so a link that was already broken now shows the error.	The document looks correct on screen, but the printout, print preview or exported PDF shows the error. Afterwards the error also appears in the document.
Text with cross-references was copied or pasted into a different document that does not contain the targets.	The errors are all in a section that came from another file. Pressing F9 in the original file shows the correct text there.
Someone deleted or replaced a heading or caption while editing or accepting tracked changes, which removed its hidden _Ref bookmark.	The document has several authors or a tracked-changes history. In Insert > Bookmark, tick Hidden bookmarks. The _Ref bookmark that the field uses (visible with Alt+F9) is not in the list.
A manually added bookmark was deleted, renamed or misspelled in a REF field.	Press Alt+F9 (Mac: Option+F9) to show field codes. The field says { REF BookmarkName } and that name is not in the Insert > Bookmark list.

How to fix it

1. Undo right away if the error just appeared

If the error appeared the moment you pressed F9, printed or saved, press Ctrl+Z (Mac: Cmd+Z) right away.
Word restores the text the field showed before the update.
Before you print or export again, use one of the fixes below. Otherwise the error comes back.

2. Find each broken cross-reference and re-insert it

Word for Microsoft 365, 2024, 2021, 2019 on Windows and Mac. On Windows the command is on the References tab. On Mac it is Insert > Cross-reference in the menu bar.

Press Ctrl+F (Mac: Cmd+F) and search for "Reference source not found" to jump to each error.
Click the error text and delete it. The whole field is deleted as one piece.
Put the cursor where the reference should go. On Windows, open References > Cross-reference. On Mac, open Insert > Cross-reference.
Choose the Reference type (Heading, Figure, Table, Numbered item or Bookmark). Choose what to insert (for example Heading text or Page number). Select the correct item in the list and click Insert.
If the item you need is not listed, recreate the heading or caption first (References > Insert Caption for captions), then insert the cross-reference.
Press Ctrl+A and then F9 (Mac: Cmd+A, then F9 or Fn+F9) to update all fields. Confirm that no errors are left.

3. See what each broken field was pointing to

Windows: Alt+F9. Mac: Option+F9 (add Fn on keyboards where F-keys control the hardware).

Press Alt+F9 (Mac: Option+F9) to switch all fields to their codes.
Each broken reference shows something like { REF _Ref123456789 \h }. The name after REF is the missing target.
Go to Insert > Bookmark and tick Hidden bookmarks to list every _Ref bookmark that still exists. If the name is missing, its target was deleted.
Press Alt+F9 (Mac: Option+F9) again to return to normal view. Then re-insert the reference (see the previous fix) or delete it.

4. Freeze the current text so printing or PDF export does not break it

Windows: File > Options > Display > Update fields before printing. Mac: Word > Settings (Preferences on older versions) > Print > Update fields.

Use this when the document looks correct on screen and you only need a clean printout or PDF.
Press Ctrl+A (Mac: Cmd+A) to select everything, then press Ctrl+F11 (Mac: Cmd+F11) to lock all fields so they do not update.
Or turn off Update fields before printing (the path is under Applies to).
Print or save as PDF, then check the output.
This only hides the problem. To unlock the fields later, press Ctrl+Shift+F11 (Mac: Cmd+Shift+F11).

5. Convert the cross-references to plain text

Use this for a final version when you no longer need live references. Save a copy first.
If the correct text is still showing, do not update fields first. If it is not, press Ctrl+Z after the update to get the text back.
Press Ctrl+A (Mac: Cmd+A), then Ctrl+Shift+F9 (Mac: Cmd+Shift+F9) to unlink all fields.
Each field becomes the plain text it was showing, so it can no longer break. Automatic tables of contents and page numbers in the body become static too, so do this only in the final copy.
Search for "Reference source not found" and type the correct text over any errors that are left.

Next time, skip the search

Crade is an AI assistant for Mac and Windows that sees your screen. When a message like this pops up, ask “what does this mean?” and it explains the exact error in front of you, step by step.

Download Crade

Still not fixed?

If the errors come back after you re-insert references, the targets are probably being lost as the document is edited. Retyping over a whole heading or caption, pasting over it, or accepting tracked deletions removes its hidden bookmark. Edit inside the heading text instead of replacing all of it. If the document came from someone else, ask the author for the version before the targets were removed. If Word behaves oddly in other ways too (fields will not update, or crashes), repair Office from Settings > Apps > Installed apps > Microsoft 365 > Modify > Quick Repair on Windows. For company documents, your IT help desk or the template owner can rebuild the styles and captions the references depend on.

Questions people ask

Why does the error appear only when I print or save as PDF?

Printing and PDF export update all fields first. A cross-reference whose target was already deleted keeps its old text on screen until that update, then switches to the error. Lock the fields (Ctrl+F11) or re-insert the broken references before you print.

How do I remove all "Error! Reference source not found" messages at once?

Word has no single built-in command that deletes only broken cross-references. Use Ctrl+F to jump to each one and delete it. Or, if the correct text is still showing, select all and press Ctrl+Shift+F9 to turn every field into plain text.

Is "Error! Bookmark not defined." the same problem?

Yes, it has the same cause. Microsoft lists both messages for a field whose target bookmark no longer exists. "Bookmark not defined" is more common in tables of contents and page references. "Reference source not found" is more common in cross-references.

Can I get the original text back?

If the error has just appeared, press Ctrl+Z right away to restore the previous text. Otherwise, open an earlier version with File > Info > Version History (for files on OneDrive or SharePoint), or open a copy saved before the update.

Does this error mean my Word document is corrupted?

Usually not. It only means a field points to something that was deleted. Repairing Office only helps in the rare case where references are broken even though the targets clearly still exist.

Sources

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