"At the time of saving a custom bundle, you may see an error that deals with repeat names of a brush, brush tip, or another file name. For any edits you make, or repeat textures/brush tips you may use, be sure to edit the name to something new, such as adding a number or word to your file name. For instance, if you have a repeat of chalk.png, you can edit the name of the tip, and save it as chalk-1.png or chalk-custom.png. This should resolve those bundling issues!"

— Draw and Paint Better with Krita von Wesley Gardner (38%)