Arqade is a question and answer site for passionate videogamers on all platforms. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am running a 100% vanilla 1.5.1 server. I get - as soon as someone joins - tons of these here: Input/output error
    at Method)
    at Source)
    at acg.a(SourceFile:307)
    at acg.a(SourceFile:249)
    at ach.close(SourceFile:230)
    at Source)
    at Source)
    at acj.a(SourceFile:137)
    at acj.c(SourceFile:125)
    at akv.b(SourceFile:29)
    at Source)

There is enough space on the harddisk, so that cannot be the issue. Any idea what could be wrong?

share|improve this question
Does the server crash, do something else unwanted, or is everything working and these are just harmlessly spamming the console output? I've deobfuscated the trace using MCP's class/function names, and it seems to be a problem writing Region files, but that doesn't tell me much unless I know what else is happening when this exception gets thrown. – SevenSidedDie Mar 28 '13 at 18:49
It seems to lag the server. I am also worried that my region files might be corrupted. – uncovery Mar 28 '13 at 21:49
@SevenSidedDie I generated a new map and the problem seems to be gone. It must have corrupted the map somewhere. – uncovery Mar 30 '13 at 10:17

Follow these steps to fix your issue:

  • Go to your minecraft server file
  • Right click and open with winrar
  • Go to the .gar
  • Double click the ip data drive on the qb.k file
share|improve this answer
> Double click the ip data drive on the qb.k file ?? I am on a linux console, I know how to open this file, but the last line confused me. – uncovery Mar 28 '13 at 14:18
@uncovery It's confusing because it's gibberish. – SevenSidedDie Mar 28 '13 at 17:20

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.