This error is most commonly caused by incorrectly setup Photoshop files. Please ensure you have watched the beginning of the Action video tutorial to see if you have set up your file correctly. Below are the solutions to this error:

• Check if you give correct names to your layers (For example ‘brush‘ or ‘mask‘, always give the name without commas);
• Make sure you are using the English version of Photoshop;
  
• Make sure you have loaded the brushes into your brushes panel before playing the action. If there are brushes included in the action download ( ’.abr’ file ), then it must be loaded before playing the action or you get this error;
• Go to the Timeline panel and delete it if you have one. For this go to the right corner of the Timeline panel, click on settings icon and select ‘Delete the timeline’;
• If you have done everything above and are still getting errors across mutiple photos, please reset your preference files. To do that, hold down Alt, Ctrl, and Shift keys (Mac: Command, Option, Shift) while starting up Photoshop. A dialog box will appear asking if you wish to delete the preferences/settings file. Delete it and then run the action again. If you are using Photoshop CC, you can reset your preference files by going to the menu, ‘Edit > Preferences > General’ and then selecting ‘Reset Preferences on Quit‘;