I'm running minecraft 1.4.7 with the Magic Launcher. I'm trying to add Forge (build 497) and it gives me :
2013-03-10 00:07:51 [iNFO] [sTDERR] Exception in thread "Minecraft main thread" java.lang.NoSuchMethodError: jg.a(Lji;)Ljg;
2013-03-10 00:07:51 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:425)
2013-03-10 00:07:51 [iNFO] [sTDERR] at asq.a(SourceFile:56)
2013-03-10 00:07:51 [iNFO] [sTDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:744)
2013-03-10 00:07:51 [iNFO] [sTDERR] at java.lang.Thread.run(Unknown Source)
Can someone help me?