sbt NullPointerException resolved by using sbt 0.13.16

[DavidAStevenson]

I am reading this book years after it was published, and wanted to have a play with the code samples.

Running sbt in CodeSamples eventually turned up a NullPointerException as shown further below.

I was able to get around this by updating project/build.properties as follows, so I leave this as a note for any others who might follow:
-sbt.version=0.13.8
+sbt.version=0.13.16
(higher versions might work too, but I stuck with the 0.13 series)

~/src/ReactiveDesignPatterns/CodeSamples$ sbt
copying runtime jar...
[info] [launcher] getting org.scala-sbt sbt 0.13.8 (this may take some time)...
...
[info] Done updating.
java.lang.NullPointerException
at java.base/java.util.regex.Matcher.getTextLength(Matcher.java:1770)
at java.base/java.util.regex.Matcher.reset(Matcher.java:416)
...