Need help!: Python [Errno 13] Permission denied: 'artsciimg.png'

Hi guys, I really need help figuring out this error on Python. This python script works fine on my local computer, but when I push it to my server, it is showing error when the script tries to save an Image. Here's my code:

def magic(usrInput):

.

.

.

     im = Image.new("RGB",(x,y))

     for j in range(y):

         for i in range(x):

.

.

     im.save("artsciimg.png")

And the error says: "[Errno 13] Permission denied: 'artsciimg.png'"

My local PC is running on Windows, and my server is on Ubuntu. I really need to know what's going on, the project is due in less than 36 hours :(