404 error page needed for build

[mjakobs1x]

...

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Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Formatting passes locally with my changes
• I have rebased against main before asking for a review

[mjakobs1x]

needed for exceptions on build ...
;-) copied from other app add added to tax app