Geany editor

[Mike429W]

I'm very new at Python and the Geany text editor. When I tried to save a file, the following message popped up:

Error saving file.
Error renaming temporary file. Permission denied.
The file on disk may now be truncated!

That's the first time I've ever seen that!
Can someone tell me why I'm receiving this message?

[Axel_Erfurt]

which operating system?
Where do you want to save the file?

[Mike429W]

I'm running Geany on a Windows 10 OS.
I'm saving the file to a folder on my Windows desktop.