Thanks for your response, sir.
Actually, what I did was that I initially estimated an SVEC model using the interface, and I saved each of the impulse response graphs in.png format in a folder I created on the desktop.
Then I clicked on the multiplot functions and the attached interface popped up, I included the names of those graphs in the input file path and the folder address in the output file path and I got an error message.
? multiplot("f1" "f2" "f3" "f4", null, 2, 2, null)
> multiplot("f1" "f2"
Expected ')' but found 'f2'
Thanks