Minecraft/Tekkit Failed to bind port after Portforwarding?

So I port forwarded my tekkit server then in the Server.properties folder I put my external IP and then it gives me the error "Failed to bind port, Perhaps a server is already running?"
I restarted my computer to make sure there wasn't a server running.
I also tried lever the IP section of the properties file empty.
I also tried putting my Ipv4 Address there.
Any good fix to this?

If it helps this is a screenshot of the portforward thing:
//st.prntscr.com/2017/12/27/0503/img/0_173a7b_211be8ff.png

Like I said I tried putting 1) My external IP 2) IPv4 Address 3) Nothing in the Ip section of.Properties

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