I'm guessing it tells you this because you haven't downloaded SRL yet.
So...
How to download SCAR and SRL (and Subversion)
Step 1- Download
this
Step 2- Download
this
Step 3- Uninstall any instances of SCAR or Subversion you may have on your computer
Step 4- Run the two installers that you downloaded in the first 2 steps
Step 5- Once they are both installed, open SCAR
Step 6- Once in SCAR, go to
Tools and then
Options
Step 7- Click on the
SRL Download tab
(Image found at
this adress, all credit goes to Dark Sniper and WT-F)
Step 8- Click on
Subversion Repository so that the little black dot appears next to it (like in the picture)
Step 9- Click the button
Checkout, a black window will pop up, and white words will start appearing in it. Wait until the black window disappears.
Step 10- Click
OK, and your done
If your still having problems...
Step 1- Open SCAR, and go to
File, then click
Update SRL to SVN
Step 2- A small box will pop up, with the number 11 in it. press the down arrow once so that the number in the box is 10, and then press OK.
Step 3- Another black box with white writing will pop up, wait for it to disappear
You should now be ready to run any script!
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If you still cant run your scripts after that, then you need some
SERIOUS help.