One cause of the Error -43 message is trying to run Screenwriter 6.0 on High Sierra. Screenwriter 6.0 is not compatible with High Sierra. The solution is to upgrade to Mac Screenwriter 6.5, which is High Sierra compatible.
If, however, you are running Screenwriter 6.5 and the message says there is no default template, you have two ways to fix it. One way is to reinstall the software, which should reinstall the templates as well.
The alternative is to create a new default template by doing the following:
- Open a document that has the format you want as your default. If you do not have one, open the sample screenplay document -- or any of the sample documents that have the format you'd like.
- Use the Format>Element Styles menu command.
- Check the Save as Default for all new Documents checkbox located in the lower right corner of the Element Styles window.
- Click OK to save the changes and create the default template.
Related Article: Upgrading to Mac Screenwriter 6.5 from Screenwriter 6