-Output doesn't work when I run scripts in file. #1307

I used the command "scriptcs a.csx -O a.txt"
But there is not "a.txt"
The scripts in "a.txt" are "Console.WriteLine(1)"
scriptcs has written "1" on my screen but there is not "a.txt"
If the scripts in "a.csx" are wrong, there will be some message in "a.txt" .