Error Code:

Exception reading C:\Users\Dragon boy\AppData\Roaming\.minecraft\saves\Modern Redstone house-1.0.0\level.dat_old java.util.zip.ZipException: Not in GZIP format at java.base/java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:165) at java.base/java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79) at java.base/java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91) at pt.b(SourceFile:31) at pt.a(SourceFile:47) at pt.a(SourceFile:42) at dqt.b(SourceFile:293) at dqt.a(SourceFile:262) at dqt.a(SourceFile:216) at dqt.a(SourceFile:169) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1760) at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373) at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182) at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655) at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622) at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)