network unreachable ERROR

i have configured my ROuterOS and it was working properly.
i have left for 1 month and when i m back every time i try to connect to internet through Mikrotik i get the network is unreachable error
can anyone help me here?
error.JPG

i have configured the router with a dsl internet
mikrotik5.PNG

any idea here?
anyone who can help plz?

check your route settings!!