Reading the CSV in spark

Hi,
when I am loading the CSV the error is occuring.

export YARN_CONF_DIR=/etc/hadoop/conf/
export HADOOP_CONF_DIR=/etc/hadoop/conf/

rm -r linkage
mkdir linkage
cd linkage/
curl -L -o donation.zip https://bit.ly/1Aoywaq
unzip donation.zip
unzip ‘block_*.zip’

hadoop fs -rm -r -f linkage
hadoop fs -mkdir linkage
hadoop fs -put block_*.csv linkage

/usr/spark2.0.1/bin/spark-shell

spark
spark.sparkContext
val prev = spark.read.csv(“linkage”)

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Error

java.lang.RuntimeException: Multiple sources found for csv (org.apache.spark.sql.execution.datasources.csv.CSVFileFormat, com.databricks.spark.csv.DefaultSource15)
, please specify the fully qualified class name.

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any help will be greatly appreciated.

Thank you,