> df <- read.df(sqlContext,"hdfs://192.168.1.129:8077/tmp/vipcs.txt")
Error in invokeJava(isStatic = TRUE, className, methodName, ...) :
  java.lang.AssertionError: assertion failed: No predefined schema found, and no Parquet data files or summary files found under hdfs://192.168.1.129:8082/tmp/vipcs.txt.
        at scala.Predef$.assert(Predef.scala:179)
        at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$MetadataCache.org$apache$spark$sql$execution$datasources$parquet$ParquetRelation$MetadataCache$$readSchema(ParquetRelation.scala:512)
        at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$MetadataCache$$anonfun$12.apply(ParquetRelation.scala:421)
        at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$MetadataCache$$anonfun$12.apply(ParquetRelation.scala:421)
        at scala.Option.orElse(Option.scala:257)
        at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation$MetadataCache.refresh(ParquetRelation.scala:421)
        at org.apache.spark.sql.execution.datasources.parquet.ParquetRelation.org$apache$spark$sql$execution$datasources$parquet$ParquetRelation$$metada

这个怎么处理，什么原因！