Plugins aren't loading

Hey everyone. I used to be the host of a spigot server, but since I've recently stopped playing, I gave the server files to a friend so he could host. The server used to be working fine before I transferred the files, but now none of the plugins are loading. We've tried looking online but we can't find a fix. Can anyone help?

 

This is what console shows when it starts up:


[15:02:58 INFO]: Starting minecraft server version 1.8.9
[15:02:58 WARN]: To start the server with more ram, launch it as "java -Xmx1024M -Xms1024M -jar minecraft_server.jar"
[15:02:58 INFO]: Loading properties
[15:02:58 ERROR]: Exception handling console input
java.io.IOException: The handle is invalid
at java.io.FileInputStream.readBytes(Native Method) ~[?:1.8.0_77]
at java.io.FileInputStream.read(Unknown Source) ~[?:1.8.0_77]
at java.io.BufferedInputStream.read1(Unknown Source) ~[?:1.8.0_77]
at java.io.BufferedInputStream.read(Unknown Source) ~[?:1.8.0_77]
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source) ~[?:1.8.0_77]
at sun.nio.cs.StreamDecoder.implRead(Unknown Source) ~[?:1.8.0_77]
at sun.nio.cs.StreamDecoder.read(Unknown Source) ~[?:1.8.0_77]
at java.io.InputStreamReader.read(Unknown Source) ~[?:1.8.0_77]
at java.io.BufferedReader.fill(Unknown Source) ~[?:1.8.0_77]
at java.io.BufferedReader.readLine(Unknown Source) ~[?:1.8.0_77]
at java.io.BufferedReader.readLine(Unknown Source) ~[?:1.8.0_77]
at ko$2.run(SourceFile:81) [minecraft_server.1.8.9.jar:?]
[15:02:58 INFO]: Default game type: CREATIVE
[15:02:58 INFO]: Generating keypair
[15:02:58 INFO]: Starting Minecraft server on *:25565
[15:02:58 INFO]: Using default channel type
[15:02:58 INFO]: Preparing level "OregCity"
[15:02:58 INFO]: Preparing start region for level 0
[15:02:59 INFO]: Preparing spawn area: 53%
[15:03:00 INFO]: Done (1.582s)! For help, type "help" or "?"