run error

[14:03:18] [Client thread/INFO]: Setting user: Player218
Exception in thread "Client thread" [14:03:18] [Client thread/INFO]: [STDERR]: java.lang.Error: Unresolved compilation problem:
	Type mismatch: cannot convert from List<Object> to List<T>

[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.util.math.Cartesian$GetList.apply(Cartesian.java:57)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.util.math.Cartesian$GetList.apply(Cartesian.java:1)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at com.google.common.collect.Iterators$7.transform(Iterators.java:750)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.state.BlockStateContainer.<init>(BlockStateContainer.java:73)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.Block.createBlockState(Block.java:1113)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.Block.<init>(Block.java:305)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.Block.<init>(Block.java:314)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.BlockAir.<init>(BlockAir.java:18)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.block.Block.registerBlocks(Block.java:1171)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.init.Bootstrap.register(Bootstrap.java:500)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.client.Minecraft.<init>(Minecraft.java:439)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at net.minecraft.client.main.Main.main(Main.java:115)
[14:03:18] [Client thread/INFO]: [STDERR]: 	at Start.main(Start.java:11)