I've build a nuclear reactor facillity with 4 rectors.
When i place a Reactor Chamber to any of m reactors an error comes in the console:
Display Spoiler
java.lang.RuntimeException: class ic2.TileEntityReactorChamber is missing a mapping! This is a bug!
at ow.b(SourceFile:46)
at to.a(SourceFile:134)
at ld.a(SourceFile:62)
at ok.b(ok.java:108:)
at ok.a(ok.java:133)
at fd.a(World.java:292)
at oz.a(SourceFile:72)
at px.b(EntityRenderer.java:485)
at EntityRendererProxy.b(EntityRendererProxy.java:14)
at net.minecraft.client.Minecraft.run(SourceFile:781)
at java.lang.Thread.run(Unknown Source)
And after that im building other things in m world.
When I save and quit and reopen the map all things in the chuncks where the reactors are have been reseted to the last save before i placed the first reactor chamber.
Only the Chunks where the reactors are the other are saving correctly
im using IC²v0.90
sorry im german and my english is reall not good i hope you understood it and you can help me to fix this.