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Failed to load class for data source: com.databricks.spark.csv
java.lang.RuntimeException: Failed to load class for data source: org.apache.spark.sql.cassandra	at scala.sys.package$.error(package.scala:27)	at org.apache.spark.sql.sources.ResolvedDataSource$.lookupDataSource(ddl.scala:220)	at org.apache.spark.sql.sources.ResolvedDataSource$.apply(ddl.scala:233)	at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:114)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.spark.api.csharp.CSharpBackendHandler.handleMethodCall(CSharpBackendHandler.scala:156)	at org.apache.spark.api.csharp.CSharpBackendHandler.handleBackendRequest(CSharpBackendHandler.scala:103)	at org.apache.spark.api.csharp.CSharpBackendHandler.channelRead0(CSharpBackendHandler.scala:30)	at org.apache.spark.api.csharp.CSharpBackendHandler.channelRead0(CSharpBackendHandler.scala:27)	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319)	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787)	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130)	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)	at java.lang.Thread.run(Unknown Source)