WARNING: could not delete file

[darenwelsh]

In the yarn window:

Jun 13, 2018 6:21:45 PM fi.iki.elonen.NanoHTTPD$DefaultTempFileManager clear
WARNING: could not delete file
java.lang.Exception: could not delete temporary file
        at fi.iki.elonen.NanoHTTPD$DefaultTempFile.delete(NanoHTTPD.java:400)
        at fi.iki.elonen.NanoHTTPD$DefaultTempFileManager.clear(NanoHTTPD.java:443)
        at fi.iki.elonen.NanoHTTPD$HTTPSession.execute(NanoHTTPD.java:875)
        at fi.iki.elonen.NanoHTTPD$ClientHandler.run(NanoHTTPD.java:189)
        at java.base/java.lang.Thread.run(Thread.java:844)