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play のコンパイル時にエラー

[info] LESS compiling on 3 source(s)
[error] [object Object] (/Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js#594)	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:594 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:77 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:659 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/import-visitor.js:25 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:664 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:58 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:266 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:107 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/main/trireme.js:805 (submitTick)
[info]
[trace] Stack trace suppressed: run last web-assets:less for the full output.
[error] (web-assets:less) com.typesafe.sbt.jse.SbtJsTask$JsTaskFailure: [object Object] (/Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js#594)	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:594 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:77 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:659 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/import-visitor.js:25 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:664 (anonymous)
[error] 	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:58 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:266 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:107 (anonymous)
[error] 	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/main/trireme.js:805 (submitTick)
[error] application -

! @6l9n8hn08 - Internal server error, for (GET) [/] ->

play.PlayExceptions$UnexpectedException: Unexpected exception[JsTaskFailure: [object Object] (/Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js#594)	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:594 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:77 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:659 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/import-visitor.js:25 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:664 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:58 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:266 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:107 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/main/trireme.js:805 (submitTick)
]
	at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:237) ~[na:na]
	at play.PlayReloader$$anon$1$$anonfun$play$PlayReloader$$anon$$taskFailureHandler$1.apply(PlayReloader.scala:230) ~[na:na]
	at scala.Option.map(Option.scala:145) ~[scala-library-2.11.5.jar:na]
	at play.PlayReloader$$anon$1.play$PlayReloader$$anon$$taskFailureHandler(PlayReloader.scala:230) ~[na:na]
	at play.PlayReloader$$anon$1$$anonfun$reload$2.apply(PlayReloader.scala:90) ~[na:na]
Caused by: com.typesafe.sbt.jse.SbtJsTask$JsTaskFailure: [object Object] (/Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js#594)	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:594 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:77 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:659 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/import-visitor.js:25 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/node-modules/webjars/less/lib/less/parser.js:664 (anonymous)
	at /Users/koya/dev/nudele/nudele/project/target/less/sbt-less-1.0.0.jar:58 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:266 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/node/fs.js:107 (anonymous)
	at /Users/Apigee/src/noderunner/node10/node10src/src/main/javascript/io/apigee/trireme/node10/main/trireme.js:805 (submitTick)

	at com.typesafe.sbt.jse.SbtJsTask$$anonfun$com$typesafe$sbt$jse$SbtJsTask$$executeJsOnEngine$1.apply(SbtJsTask.scala:195) ~[na:na]
	at com.typesafe.sbt.jse.SbtJsTask$$anonfun$com$typesafe$sbt$jse$SbtJsTask$$executeJsOnEngine$1.apply(SbtJsTask.scala:167) ~[na:na]
	at scala.util.Success$$anonfun$map$1.apply(Try.scala:206) ~[scala-library-2.11.5.jar:na]
	at scala.util.Try$.apply(Try.scala:161) ~[scala-library-2.11.5.jar:na]
	at scala.util.Success.map(Try.scala:206) ~[scala-library-2.11.5.jar:na]

上のようなエラーが出た

JsTaskFailure while less compilation · Issue #2662 · playframework/playframework · GitHub

参考にしたら治った。