How can not Run the umlet extensions?

[BojunZhong]

I am a vscode extension programmer, I want to learn the umlet extensions. Well I just want to Run that, generally, running vscode extensions can be used as F5. If I press F5,it was showed:

[afdia]

I dont think it is caused bei Umlet (we don't require a browser path), maybe another extension is the problem.
You could try it on a new installation of vscode without other extensions

[BojunZhong]

Thanks for replying, well, if you want to run the umlet extensions, what is the process will you do?

[afdia]

As mentioned in https://marketplace.visualstudio.com/items?itemName=TheUMLetTeam.umlet

For a new diagram, create an empty text file with a ".uxf"-extension!

Or just open an existing uxf diagram in vscode and it will use the Umlet plugin