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[1.7.10] bug after a power cut

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I'm using forge for 1.7.10.


After a power cut, i started again the server, but bug :



"[16:19:15] [server thread/WARN] [FML/]: Forge Mod Loader detected that the backup level.dat is being used.


This may happen due to a bug or corruption, continuing can damage

your world beyond repair or lose data / progress.


It's recommended to create a world backup before continuing.


Run the command /fml confirm or or /fml cancel to proceed.

Alternatively start the server with -Dfml.queryResult=confirm or -Dfml.queryResult=cancel to preselect the answer."





I tried "confirm", reset then no change when i start the server

then i tried "cancel",reset then no change when i start the server



I've try to google the /fml confirm, i found nothing interesting.

What should i do?




lastest log :



[16:19:12] [server thread/INFO]: Starting minecraft server version 1.7.10

[16:19:15] [server thread/INFO]: Loading properties

[16:19:15] [server thread/INFO]: Default game type: SURVIVAL

[16:19:15] [server thread/INFO]: Generating keypair

[16:19:15] [server thread/INFO]: Starting Minecraft server on *:25565

[16:19:15] [server thread/INFO]: Preparing level "world"

[16:19:15] [server thread/ERROR]: Exception reading .\world\level.dat

java.util.zip.ZipException: Not in GZIP format

at java.util.zip.GZIPInputStream.readHeader(Unknown Source) ~[?:1.7.0_13]

at java.util.zip.GZIPInputStream.<init>(Unknown Source) ~[?:1.7.0_13]

at java.util.zip.GZIPInputStream.<init>(Unknown Source) ~[?:1.7.0_13]

at net.minecraft.nbt.CompressedStreamTools.func_74796_a(CompressedStreamTools.java:29) ~[du.class:?]

at net.minecraft.world.storage.SaveFormatOld.func_75803_c(SourceFile:56) [ayr.class:?]

at net.minecraft.world.chunk.storage.AnvilSaveConverter.func_75801_b(SourceFile:88) [ayn.class:?]

at net.minecraft.server.MinecraftServer.func_71237_c(MinecraftServer.java:158) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:198) [MinecraftServer.class:?]

at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:258) [lt.class:?]

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387) [MinecraftServer.class:?]

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]



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