Create and save new bt file.

[andy27182]

Describe the bug
I just started using behaviortree and groot2. After installing the tools, I created a new behavior tree file and reported an error when saving it.

Screenshots and videos

Desktop (please complete the following information):

• OS: Ubuntu
• Version 24.04

[mounteverset]

@andy27182 Can you save to other locations? How did you start Groot? My guess would be that you are not allowed to create, edit or remove files (read-only access) from that directory.