type mismatch

[abou]

Hi,

I have this error while trying to compile the project

/src/main/scala/org/dbpedia/spotlight/wikistats/ComputeStats.scala:99: error: type mismatch;
[ERROR] found : org.apache.spark.rdd.RDD[Nothing]
[ERROR] required: org.apache.spark.rdd.RDD[(Long, String, Int)]
[ERROR] Note: Nothing <: (Long, String, Int), but class RDD is invariant in type T.
[ERROR] You may wish to define T as +T instead. (SLS 4.5)
[ERROR] spotterSfsRDD

Regards,