Gray Square in my RF Module circuit in Proteus 8

[easyglory]

How do I fix this circuit's gray dot (pin 17-yellow marked circle).The circuit I am trying to simulate is on the link I have mentioned ;

RF Remote Control Circuit for Home Appliances

This RF Remote Control Circuit is used for many home appliances like burglar alarm, security systems, etc. and is designed without using Microcontroller.

www.electronicshub.org

Please help. TIA

 

[FvM]

Don't know how the circuit behaves in Proteus, but you should at least copy it correctly. D5 flipped.

 

[spudboy488]

The gray square indicates the pin state is unknown (not high/not low). Fixing the LED (per FvM) may correct it or it might just be the way the part is simulated.