KB46443: "JavaScript errors were encountered on this page" error message appears when formatting the outer-most attribute in MicroStrategy Web 9.4.1.

SYMPTOM:
In Strategy Web 9.4.1, users may experience a JavaScript error when trying to format the outer-most attribute of a grid in Outline Mode in a document, as shown below:

*JavaScript errors were encountered on this page.* Click here for more details
Strategy client-side error log:
TypeError: Cannot call method 'getAttribute' of undefine

1. Create a document with a grid report in Outline Mode.
2. In Properties & Formatting, disable "Show column headers" for the grid.
3. Execute the document, to Interactive Mode.
4. Click the "Restore Normal Screen Mode" to exit out of full-screen, if the document executed in full-screen.
5. Switch the view mode to Editable Mode.
6. Click on the outer-most attribute, try bolding it, either using the Formatting toolbar, or Properties & Formatting. If the error doesn't appear immediately, try unbolding it.
7. Notice the JavaScript error appears.

 
CAUSE:
This is a known issue in Strategy Web 9.4.1.
ACTION:
This issue has been addressed in Strategy Web 10.x. Upgrade to take advantage of the fix.
WORKAROUND:
Users can format the grid while "Show column headers" is enabled, and then disable the setting once formatting is complete.