myDF19.write.format("csv01").save("c:\data")
java.lang.ClassNotFoundException: Failed to find data source: myDF19. Please find packages at http://spark.apache.org/third-party-projects.html
at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:689)
at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSourceV2(DataSource.scala:743)
at org.apache.spark.sql.DataFrameWriter.lookupV2Provider(DataFrameWriter.scala:993)
at org.apache.spark.sql.DataFrameWriter.saveInternal(DataFrameWriter.scala:311)
at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:293)
... 47 elided
Caused by: java.lang.ClassNotFoundException: myDF19.DefaultSource
at scala.reflect.internal.util.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:72)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.spark.sql.execution.datasources.DataSource$.$anon
一直报错，该怎么改才对呢
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