I have upgraded to 1.5.0-RC and I get this error n...

# serialization

[Norbi]

I have upgraded to 1.5.0-RC and I get this error no matter what I try :(
Stacktrace:
'void kotlinx.serialization.modules.SerialModuleImpl.<init>(java.util.Map, java.util.Map, java.util.Map, java.util.Map)'
java.lang.NoSuchMethodError: 'void kotlinx.serialization.modules.SerialModuleImpl.<init>(java.util.Map, java.util.Map, java.util.Map, java.util.Map)'
at kotlinx.serialization.modules.SerializersModuleKt.<clinit>(SerializersModule.kt:74)
at kotlinx.serialization.json.Json$Default.<init>(Json.kt:65)
at kotlinx.serialization.json.Json$Default.<init>(Json.kt)
at kotlinx.serialization.json.Json.<clinit>(Json.kt)
at kotlinx.serialization.json.JsonKt.Json$default(Json.kt:130)

- Kotlin version: 1.5.0

- kotlinx-serialization version: 1.2.0

- Kotlin platforms: multiplatform (JVM + JS)

- Gradle version: 6.8.3

- IDE version: 2021.1.1 RC

- Other relevant context: Java 15

Have you seen anything similar?
Thanks.

[Karlo Lozovina]

is your kotlin and plugin.serialization version the same? I have it like this:

kotlin("jvm") version "1.5.0-RC"
    kotlin("plugin.serialization") version "1.5.0-RC"

[Karlo Lozovina]

btw, somtimes I'll get weird errors from serialization (not like yours but still), it usually helps to gradle clean && gradle build from the terminal

[Norbi]

Thanks for the hints...
A transitive dependency of kotlinx-serialization-runtime:0.20.0(!!!!) caused the problem 😕

[Karlo Lozovina]

must've been fun to find that one 😄