Thread: Error when tele to castle wars

why does i get this error when i tele to castle wars or around it?

Code:

Map Amount: 1226
602 NPC Amount: 11257
Width: 560
Height: 165
Error: T1 - 123,0 - 36,36
java.io.IOException: Not in GZIP format
        at java.util.zip.GZIPInputStream.readHeader(Unknown Source)
        at java.util.zip.GZIPInputStream.<init>(Unknown Source)
        at java.util.zip.GZIPInputStream.<init>(Unknown Source)
        at OnDemandFetcher.getNextNode(OnDemandFetcher.java:450)
        at client.processOnDemandQueue(client.java:3766)
        at client.processGameLoop(client.java:3242)
        at RSApplet.run(RSApplet.java:164)
        at client.run(client.java:6213)
        at java.lang.Thread.run(Unknown Source)