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Bug: Radial/Sankey chart in Show Me corrupts workbook (Error D2E8DA72) even after Undo

Summary: 

Clicking on the Radial or Sankey chart type in the "Show Me" panel — even briefly, and even if immediately undone — permanently corrupts the workbook file. Saving and reopening the file afterward fails with Error Code D2E8DA72. 

Environment: 

- Tableau Desktop, Professional Edition 

- Version 2026.2.0 (20262.26.0603.1643) 

- Windows 

Steps to Reproduce: 

1. Open any workbook (new or existing) in Tableau Desktop 2026.2.0 

2. Select a worksheet and open the "Show Me" panel 

3. Click on the Radial (or Sankey) chart type once 

4. Immediately press Ctrl+Z (Undo) 

5. Save the workbook as a packaged .twbx file 

6. Close Tableau Desktop 

7. Reopen the same .twbx file 

Expected Result: 

The workbook should open normally, since the chart type was undone and never appears on any sheet. 

Actual Result: 

Tableau fails to load the workbook with the following error: 

Error Code: D2E8DA72 

Error: no declaration found for element 'worksheet-extension' 

Error: attribute 'extension-version' is not declared for element 'worksheet-extension' 

Error: attribute 'id' is not declared for element 'worksheet-extension' 

Error: element 'worksheet-extension' is not allowed for content model '(document-format-change-manifest,(dashboard-extension),resources?)' 

Root Cause (as far as I can diagnose): 

Even though the chart action is undone and never persists visibly in the workbook, Tableau still writes a <referenced-extensions> manifest block into the underlying .twb XML the moment the chart type is clicked. This manifest references the built-in extension (e.g. com.tableau.extension.radial) but appears to be incompatible with the workbook's own internal file-format version, causing Tableau's own XML validator to reject the file on the next load. This happens even in a workbook that never uses the chart on any actual sheet. 

Workaround (manual): 

1. Rename the .twbx file to .zip 

2. Extract the zip 

3. Open the .twb file in a text editor 

4. Search for "referenced-extensions" 

5. Delete the entire block from <referenced-extensions> to </referenced-extensions> 

6. Save the .twb file 

7. Re-zip the .twb file along with the Data folder 

8. Rename the new zip back to .twbx 

The file then opens normally with no loss of dashboard content. 

Impact: 

This is a significant reliability risk since: 

- It occurs with no warning at the time the chart is clicked or undone 

- It can silently corrupt a file that appears completely fine until the next reopen 

- It could affect students/professionals submitting workbooks for grading or review, since a file that worked when last saved may fail to open for the recipient 

I'm happy to share the exact corrupted and fixed .twb/.twbx files if useful for reproducing or debugging this on your end. 

Resolving - Error The 'New LEAD Trend by Source' dashboard component is not a pie chart.'

Trailhead Module: Reports & Dashboards for Salesforce Classic

Sub-Task: Extend Your Reporting Strategy with the AppExchange

Problem Description:

1. Unable to edit the dashboard component 'New LEAD Trend by Source' in Salesforce Classic.

2. Able to edit the dashboard component 'New LEAD Trend by Source' in Lightning Experience, however the pie chart chart is not available to be selected.

3. As a result, when checking the challenge, it shows an error -> The 'New LEAD Trend by Source' dashboard component is not a pie chart.'

Resolution:

1. Uninstall (fully remove, do not save a copy of package) the CRM adoption dashboard package in Lightning Experience under the click path Setup | Apps | Packaging | Installed Packages.

2. Switch to Salesforce Classic, go to Setup and then go to the AppExchange Marketplace.

3. Install the CRM adoption dashboard package from AppExchange Marketplace.

4. Stay in Salesforce Classic and go to edit the dashboard component 'New LEAD Trend by Source' and uncheck the Use chart as defined in source report option.

5. Save and refresh the dashboard at least one time.

6. Check your challenge for points again.

Additional Information

The pie chart is not available for selection in Lightning Experience, it is only available in Salesforce Classic.

Keywords

#Knowledge Sharing #Trailhead Challenges