title: Please use override option or check for definition, koin android?
body: <p>I am implementing Koin DI in my android application. I was successfully able to create some of the modules. However I got an exception where I tried to get object from another in module.</p>
  
  <p>These are my modules</p>
  
  <pre><code>val networkModule = module {
  factory { provideRetrofit() }
  
  single { provideNetworkApi(get()) }
  }
  
  
  fun provideRetrofit(): Retrofit {
  return Retrofit.Builder()
      .baseUrl(NetworkConstant.BASE_URL)
      .addConverterFactory(
          GsonConverterFactory.create(
              GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
                  .create()
          )
      )
      .client(OkHttpClient.Builder().build())
      .build()
  
   }
  
  fun provideNetworkApi(retrofit: Retrofit): NetworkCall =
  retrofit.create(NetworkCall::class.java)
  </code></pre>
  
  <p>view model module - i want to pass the network call object here</p>
  
  <pre><code>val viewModelModule = module {
  single { provideNetworkApi(get ()) }
  }
  </code></pre>
  
  <p>This is my code in application class</p>
  
  <pre><code>startKoin {
          androidLogger()
          androidContext(this@BaseApp)
          modules(listOf(networkModule,viewModelModule))
      }
  </code></pre>
  
  <p>This is the exception I get</p>
  
  <pre><code>java.lang.RuntimeException: Unable to create application com.mountmeru.BaseApp: org.koin.core.error.DefinitionOverrideException: Definition '[Factory:'com.mountmeru.network.NetworkCall']' try to override existing definition. Please use override option or check for definition '[Factory:'com.mountmeru.network.NetworkCall']'
      at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6465)
      at android.app.ActivityThread.access$1300(ActivityThread.java:219)
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1859)
      at android.os.Handler.dispatchMessage(Handler.java:107)
      at android.os.Looper.loop(Looper.java:214)
      at android.app.ActivityThread.main(ActivityThread.java:7356)
      at java.lang.reflect.Method.invoke(Native Method)
      at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
   Caused by: org.koin.core.error.DefinitionOverrideException: Definition '[Factory:'com.mountmeru.network.NetworkCall']' try to override existing definition. Please use override option or check for definition '[Factory:'com.mountmeru.network.NetworkCall']'
      at org.koin.core.scope.ScopeDefinition.save(ScopeDefinition.kt:25)
  </code></pre>
  
  <p>Any clue whats wrong here?</p>