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Trouble receving data from Ping Sonar using ping-arduino

Hello, when i use pingviewer i can get the correct data from my Ping sonar but as stated in the title, when i try to read data trough serial monitor on Arduino IDE, it shows that sonar is not being initiliazed.I checked the pin connections and everything seems to be correct.Is there anyway i can fix this problem?

The link i used to set the connections;

Thanks in advance.