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快速解答此問題。編譯期間，我得到以下一組錯誤;類路徑中缺少符號'type shapeless.LeftFolder'
Error:(38, 21) Symbol 'type shapeless.HListerAux' is missing from the classpath.
This symbol is required by 'value spray.routing.directives.ParamDefMagnet2.hla'.
Make sure that type HListerAux is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'ParamDefMagnet2.class' was compiled against an incompatible version of shapeless.
parameter('id) { id =>
Error:(38, 21) Symbol 'type shapeless.Poly.Case2' is missing from the classpath.
This symbol is required by 'method spray.routing.directives.ParamDefMagnet2.MapReduce.from'.
Make sure that type Case2 is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'ParamDefMagnet2.class' was compiled against an incompatible version of shapeless.Poly.
parameter('id) { id =>
Error:(38, 21) Symbol 'type shapeless.PrependAux' is missing from the classpath.
This symbol is required by 'value spray.routing.directives.ParamDefMagnet2.MapReduce.ev'.
Make sure that type PrependAux is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'ParamDefMagnet2.class' was compiled against an incompatible version of shapeless.
parameter('id) { id =>
Error:(38, 21) Symbol 'type shapeless.HListerAux' is missing from the classpath.
This symbol is required by 'value spray.routing.directives.ParamDefMagnet2.hla'.
Make sure that type HListerAux is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'ParamDefMagnet2.class' was compiled against an incompatible version of shapeless.
parameter('id) { id =>
雖然，總之，問題是與「不成形」，這是我已經包含作爲依賴作爲（與旋轉變壓器）的文庫，
resolvers ++= Seq(
Resolver.sonatypeRepo("releases"),
Resolver.sonatypeRepo("snapshots")
)
libraryDependencies ++= Seq(
"com.chuusai" %% "shapeless" % "2.3.2"
)
我希望合適的建議作爲修復。