Upon launching the server the server goes through and gives this error message:

java.io.IOException: The handle is invalid
at java.io.FileInputStream.readBytes(Native Method) ~[?:1.7.0_45]
at java.io.FileInputStream.read(Unknown Source) ~[?:1.7.0_45]
at java.io.BufferedInputStream.read1(Unknown Source) ~[?:1.7.0_45]
at java.io.BufferedInputStream.read(Unknown Source) ~[?:1.7.0_45]
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source) ~[?:1.7.0_45]
at sun.nio.cs.StreamDecoder.implRead(Unknown Source) ~[?:1.7.0_45]
at sun.nio.cs.StreamDecoder.read(Unknown Source) ~[?:1.7.0_45]
at java.io.InputStreamReader.read(Unknown Source) ~[?:1.7.0_45]
at java.io.BufferedReader.fill(Unknown Source) ~[?:1.7.0_45]
at java.io.BufferedReader.readLine(Unknown Source) ~[?:1.7.0_45]
at java.io.BufferedReader.readLine(Unknown Source) ~[?:1.7.0_45]
at lk.run(SourceFile:78) [minecraft_server.1.7.jar:?]

Im not sure why it does it, it throws it on an my existing world and on a new world i created just for testing.