I made a fairly small ktor project and am now trying to add Locations, but the second it's on the classpath (doesn't change if I install or don't) I get the following:

Exception in thread "main" java.lang.AbstractMethodError: io.ktor.server.engine.ApplicationEngineEnvironmentReloading.getDevelopmentMode()Z
	at io.ktor.application.Application.<init>(Application.kt:20)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:269)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:125)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:245)
	at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:126)
	at io.ktor.server.netty.EngineMain.main(EngineMain.kt:26)

not sure where to go from here? This error isn't that descriptive

sounds like a class path problem. can you check that you have the same version of all ktor jars in the classpath?

will check, but should be, I'm using a variable for them, I'll share my build.gradle, two secs

you could add the bom to make sure that you have the correct ktor versions everywhere

you can run

./gradlew dependencies

I think I spotted it, two secs

add this:

implementation(enforcedPlatform("io.ktor:ktor-bom:$ktorVersion"))