GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Intermediate Level

List any ERROR messages you received:
Failed to load data:

Fatal parse error in brush file 'C:\Users\Mike\.gimp-2.8\brushes\Sparkles_Brush_by_WingsOfAHero (1).abr': unable to decode abr format version 6.

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Trying to save a new brush and get message - not sure why it mentions this particular brush Sparkles_Brush_by_WingsOfAHero (1).abr mine has a unique name

When you create and save a brush GIMP reloads and refreshes all brush files in the brushes folder. This brush probably returns the error because GIMP can not open it for some reason. Possibly a corrupt file. I would just remove the ABR file and if you want to still use the brushes on it open it in ABR viewer https://sourceforge.net/projects/abrviewer/ and save each brush as a png. Then open those png images in GIMP and save each as a separate brush file (gbr).