This error message is seen in the Bulk Product Edit app when you enable an option but leave the input field blank.
For example, if you create a task to edit prices and place a checkmark next to where it says And round to nearest but you then deleted .99 instead of replacing it with another value, you would receive this error message because our app is expecting to see a value in this input field.
If you enable this option, there must be something in the input field. If it's empty, you will receive that error message when you click on Start Bulk Editing Now.
When enabling an option and there's an input field linked to it, please ensure that you do not leave it empty.