windshield fluid not coming out
 

i have a 2000 clk 320 and one day i was driving the car on the highway and all of a sudden the windshield fluid starting pouring out,the winshield wipers work but the theres no windshield fluid coming out of the squirters now.the wiper blades move and i can hear the pump and the front light fluids work to. i don't understand why the windshield fluid wont come out and its full. someone please help!