error when building the project using sbt

[snapfinger]

Hi Edoardo, I encountered the following error when building using sbt. Pretty new to scala&sbt, do you any suggestions on this?

	.....
        [SUCCESSFUL ] jline#jline;2.14.5!jline.jar (166ms)
:: retrieving :: org.scala-sbt#boot-scala
	confs: [default]
	5 artifacts copied, 0 already retrieved (18986kB/23ms)
[info] Updated file /Users/yijun/RL/master/project/build.properties: set sbt.version to 1.0.3
[info] Loading project definition from /Users/yijun/RL/master/project
[info] Updating {file:/Users/yijun/RL/master/project/}master-build...
[info] Done updating.
/Users/yijun/RL/master/build.sbt:16: error: type mismatch;
 found   : Int(1000)
 required: scala.concurrent.duration.FiniteDuration
    pollInterval := 1000,
                    ^
[error] sbt.compiler.EvalException: Type error in expression
[error] sbt.compiler.EvalException: Type error in expression
[error] Use 'last' for the full log.