Taskfeed Template Best Practices
Do the List names on your Template match the List labels on the Board it will be used for?
As you upload a Task template, Taskfeed will analyze the Board Type (if a Board Type is selected for that Task Template) and then compare the values on the template to the List Template associated with that Board Type.
Every Board type will have a List Template associated with it, so when Boards are created, they have placeholder cards for Tasks. It will be either a custom List Template or the Default List Template. If the List Names on the Task Template don't match the List Template associated with that Board Type, you will get an error.
You can manually edit the List names on the Board and create new Lists, or upload a List Template with custom definitions to pair with the Task Templates that will be used for that particular Board Type.