The description in the log file

Description: Tesselating block model

java.lang.ClassCastException: net.minecraft.tileentity.TileEntityChest cannot be cast to vazkii.botania.common.block.tile.TileAltar
at vazkii.botania.common.block.BlockAltar.getLightValue(BlockAltar.java:135)
at net.minecraft.block.state.BlockStateContainer$StateImplementation.getLightValue(BlockStateContainer.java:450)
at net.minecraft.block.Block.func_185484_c(Block.java:352)
at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_185889_a(BlockStateContainer.java:329)
at net.minecraft.client.renderer.BlockModelRenderer$AmbientOcclusionFace.func_187491_a(BlockModelRenderer.java:594)
at net.minecraft.client.renderer.BlockModelRenderer.renderQuadsSmooth(BlockModelRenderer.java:266)
at net.minecraft.client.renderer.BlockModelRenderer.func_187498_b(BlockModelRenderer.java:139)
at net.minecraftforge.client.model.pipeline.ForgeBlockModelRenderer.func_187498_b(ForgeBlockModelRenderer.java:88)
at net.minecraft.client.renderer.BlockModelRenderer.func_187493_a(BlockModelRenderer.java:85)
at net.minecraft.client.renderer.BlockModelRenderer.func_178267_a(BlockModelRenderer.java:64)
at net.minecraft.client.renderer.BlockRendererDispatcher.func_175018_a(BlockRendererDispatcher.java:81)
at net.minecraft.client.renderer.chunk.RenderChunk.func_178581_b(RenderChunk.java:269)
at net.minecraft.client.renderer.chunk.ChunkRenderWorker.func_178474_a(ChunkRenderWorker.java:121)
at net.minecraft.client.renderer.chunk.ChunkRenderWorker.run(ChunkRenderWorker.java:45)
at java.lang.Thread.run(Unknown Source)

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