When I open the GUI it show such error with 1.5.2 mc
Display Spoiler
Description: Unexpected error
java.lang.NoClassDefFoundError: ic2/advancedmachines/ContainerSingularityCompressor
at ic2.advancedmachines.client.AdvancedMachinesClient.getGuiElementForClient(AdvancedMachinesClient.java:59)
at ic2.advancedmachines.common.AdvancedMachines.getClientGuiElement(AdvancedMachines.java:223)
at cpw.mods.fml.common.network.NetworkRegistry.openLocalGui(NetworkRegistry.java:328)
at cpw.mods.fml.common.network.FMLNetworkHandler.openGui(FMLNetworkHandler.java:356)
at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2396)
at ic2.advancedmachines.common.BlockAdvancedMachines.func_71903_a(BlockAdvancedMachines.java:277)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78760_a(PlayerControllerMP.java:366)
at net.minecraft.client.Minecraft.func_71402_c(Minecraft.java:1316)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1800)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:835)
at net.minecraft.client.Minecraft.run(Minecraft.java:760)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: ic2.advancedmachines.ContainerSingularityCompressor
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more
Caused by: java.lang.NoClassDefFoundError: ic2/common/ContainerIC2
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:227)
... 14 more
Caused by: java.lang.ClassNotFoundException: ic2.common.ContainerIC2
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:139)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 18 more