What does the error message "org.apache.spark.sql.execution.QueryExecutionException: Encountered error while reading file xxxxxx" indicate when Spark fails?

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The error message "org.apache.spark.sql.execution.QueryExecutionException: Encountered error while reading file xxxxxx" indicates that there was an error encountered while Spark was trying to read a file. This error could be caused by a number of things such as incorrect file format, corrupted file, missing file or insufficient permissions to access the file.