parboiled

问题 So I've been trying to use parboiled2 for the last few weeks now, it is possibly the most difficult dependency to add to a build I have come across in my entire life. My current error is a compile sbt assembly ) error: [error] missing or invalid dependency detected while loading class file 'Prepender.class'. [error] Could not access type PrependAux in package shapeless, [error] because it (or its dependencies) are missing. Check your build definition for [error] missing or conflicting

问题 I'm trying to add parboiled2 as a dependency to my project, and follow the Calculator example but it conflicts with spray. My current build.sbt file includes: "io.spray" %% "spray-json" % "1.3.1" withSources() withJavadoc(), "io.spray" %% "spray-can" % sprayV withSources() withJavadoc(), "io.spray" %% "spray-routing" % sprayV withSources() withJavadoc(), "io.spray" %% "spray-testkit" % sprayV % "test" withSources() withJavadoc(), When I add "org.parboiled" %% "parboiled" % "2.0.1" withSources