I'm getting this error when building my iOS KMP ap...

# koin

[Marcel]

I'm getting this error when building my iOS KMP app, it seems to be coming from Koin:

> Task :umbrella:linkDebugFrameworkIosSimulatorArm64 FAILED
e: Compilation failed: IrPropertySymbolImpl is already bound. Signature: org.koin.ksp.generated/_defaultModule|{}_defaultModule[0]. Owner: PROPERTY name:_defaultModule visibility:public modality:FINAL [val]

 * Source files: 
 * Compiler version: 2.0.21
 * Output kind: FRAMEWORK

e: java.lang.IllegalStateException: IrPropertySymbolImpl is already bound. Signature: org.koin.ksp.generated/_defaultModule|{}_defaultModule[0]. Owner: PROPERTY name:_defaultModule visibility:public modality:FINAL [val]
        at org.jetbrains.kotlin.ir.symbols.impl.IrSymbolBase.bind(IrSymbolImpl.kt:67)
        at org.jetbrains.kotlin.ir.declarations.impl.IrPropertyImpl.<init>(IrPropertyImpl.kt:63)
        at org.jetbrains.kotlin.ir.declarations.IrFactory.createProperty(IrFactory.kt:299)
        at org.jetbrains.kotlin.ir.declarations.IrFactory.createProperty$default(IrFactory.kt:282)
        at org.jetbrains.kotlin.backend.common.serialization.IrDeclarationDeserializer.deserializeIrProperty$lambda$76$lambda$70(IrDeclarationDeserializer.kt:737)
        at org.jetbrains.kotlin.ir.util.SymbolTable.declareProperty(SymbolTable.kt:800)
        at org.jetbrains.kotlin.backend.common.serialization.IrDeclarationDeserializer.deserializeIrProperty(IrDeclarationDeserializer.kt:735)
        at org.jetbrains.kotlin.backend.common.serialization.IrDeclarationDeserializer.deserializeDeclaration(IrDeclarationDeserializer.kt:800)
        at org.jetbrains.kotlin.backend.common.serialization.IrDeclarationDeserializer.deserializeDeclaration$default(IrDeclarationDeserializer.kt:793)
        at org.jetbrains.kotlin.backend.common.serialization.IrFileDeserializer.deserializeDeclaration(IrFileDeserializer.kt:41)
        at org.jetbrains.kotlin.backend.common.serialization.FileDeserializationState.deserializeAllFileReachableTopLevel(IrFileDeserializer.kt:141)
        ...

I'm trying to figure out what have I changed in my last few commits that may have caused this, because this used to work just fine... But sharing in case anyone has any quick idea!

[Marcel]

I'm using

koin = "4.0.0"
koinKsp = "1.4.0"

However I have tried with the newer beta versions and it does not resolve the issue

[Marcel]

Android builds just fine

[Marcel]

@arnaud.giuliani any ideas? We are currently blocked due to this 😞

[arnaud.giuliani]

can you downgrade your kotlin version to 2.0.20 ?

[arnaud.giuliani]

and Koin annotations is not working on kotlin with 1.4.0. Go with 2.0.0-Beta1

[Marcel]

Same issue 😞 I switched to

koin = "4.0.0"
koinKsp = "2.0.0-Beta1"
kotlin = "2.0.20"
ksp = "2.0.20-1.0.25"

[arnaud.giuliani]

can you show what you try to generate? From annotated components, and the generated stuff

[Marcel]

Is it worth showing you over a quick Huddle? It's a multi-module project so might be a bit hard to share the relevant parts over Slack

[Marcel]

Oh, I think I solved it! Verifying again and I will share more details if that's the case

[Marcel]

Solved 🙌

This is what happened:
I created a new project module (let's say :core:datasource) but I had not created a new explicit Koin module for the dependencies of that module. I have seen that it's not always required to do so, and only adding the annotations @Single or @Factory on those classes that I want to be injected does the trick (which it does on Android).
However, for this one in particular, the iOS build was broken.

@arnaud.giuliani should I always create specific Koin modules for all of the project modules?

This is how the Module looks like:

@Module
@ComponentScan("com.random.app.datasource")
class DataSourceModule

[arnaud.giuliani]

@ComponentScan can scan package over gradle modules, but not sure it's quite stable in KMP side

[Thomas Richtsfeld]

Jumping to the party a bit late 🙂

I had the same issue and deactivated the Koin default modules
arg("KOIN_DEFAULT_MODULE","false")
I was not able to find out the purpose of the default modules as I am quite new to Koin, but didn't run into any issues after removing it.

What I am trying to achieve is to create only one Koin Module that is annotated with ComponentScan . We are using KMP and have a bunch of gradle modules that are provided via one umbrella module for iOS.
I put the "scan" module into the umbrella module and was able to scan all the sub projects successfully. I hope this is the right approach. I wanted to avoid creating a Koin Module for each Gradle Module.

/**
 * Helper function to scan all annotated modules and provide them via Koin
 * TODO check if this is the better approach or if each module should expose it's own module
 */
fun scannedModules() = listOf(GlobalComponentScanModule().module)

@Module
@ComponentScan("com.company.shared")
public class GlobalComponentScanModule

@arnaud.giuliani is this approach a way to go without creating a module for each gradle module or does it bloat up at some point?

[arnaud.giuliani]

default module is generated if you don't have a proper module affected to your definitions. We also need a the defaults file to help export definitions, to be scanned outside of your module

[Thomas Richtsfeld]

Now I am confused 🙂.
We disabled the default modules. Does that mean it should not work for us?

[arnaud.giuliani]

disabling the default module will warn if you have any definition outside of any module, else it would put those definitions inside the default module

[arnaud.giuliani]

you can freely disable it, apart if you were using it actively before