I get this
```
Error:(57, 47) Kotlin: Type mismatc...
# datasciencea
Antero Duarte
10/01/2018, 2:02 PMI get this
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Error:(57, 47) Kotlin: Type mismatch: inferred type is Function1<Tuple2<String, PortableDataStream>, Boolean> but Function1<Tuple2<String!, PortableDataStream!>!, Any!>! was expected