Could not open file for writing? I have been using blender for a few years and this is the first time I have come across this problem. I am running 2.79 on Ubuntu. I was trying render a short test video for a new project and I came across this error on the top of my blender feed.

"Could not open file for writing"

And occasionally I get the error "Python: RENDER_MT_presets"

There is a triangle caution sign on the left of it. I am trying to write to the same folder of my last 6 videos. I found several videos just saying that I need to change the output source, but that didn't work. I also found this post on the forum.
Deleted .dvd file, and &quot;Could not open file for writing.&quot;
I tried changing the permission for the folder, but again it had no effect. I am now confused by this and am hoping that someone could help.
In properties window, go to "Output" tab.
Find "Output" heading within that tab.
Check the "File Extensions" box (which is below the Output save path entry).