UnityFramework not linking InApp lib when building in Xcode

I migrated my project from Unity 2018.4.32 to 2020.3.9. The game includes "InApp Purchasing" Service, and it works fine in the Editor. I have been building and publishing the game on the AppStore for years, and the Inapps were working fine. But I can't recompile the project in Xcode version 12.5 since I migrated in 2020.3.9. I get these linker error in "UnityFramework" :

Apple Match-O Linker errors :

Undefined symbols for architecture arm64:

  "_iapGetTransactionResult", referenced from:

    _InAppPurchase_iapGetTransactionResult_mF5493E35E7225FCE38904A8C01D0B349A035918E in Assembly-CSharp-firstpass.o

      _InAppPurchase_GetTransactionResult_m2EF1DA7C413AD51498C85AF89157AF7A643A81D2 in Assembly-CSharp-firstpass.o

    (maybe you meant: _InAppPurchase_iapGetTransactionResult_mF5493E35E7225FCE38904A8C01D0B349A035918E)

  "_iapGetTransactionReceipt", referenced from:

  "_iapGetCurrencyCode", referenced from:

 "_iapGetProductTitle", referenced from:

  "_iapSetGameObjectName", referenced from:

   "_iapBuy", referenced from:

  "_iapGetProductPrice", referenced from:

 "_iapRestoreCompletedTransactions", referenced from:

  "_iapRequestProductInformation", referenced from:

  "_iapGetProductDescription", referenced from:

 "_iapDestroy", referenced from:

  "_iapGetProductPriceFormated", referenced from:

  "_iapInit", referenced from:

  "_iapIsAvailable", referenced from:

      _InAppPurchase_iapIsAvailable_m9C9B421E08A49DE1E6360284533D6D89135DDD04 in Assembly-CSharp-firstpass.o

      _InAppPurchase_IsAvailable_m351E568EBDBA33CF7757CD4D8D5CE1D210EF7C46 in Assembly-CSharp-firstpass.o

    (maybe you meant: _InAppPurchase_iapIsAvailable_m9C9B421E08A49DE1E6360284533D6D89135DDD04)

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Any help would be very much appreciated.

 

I found the solution : I had some remaining files related to inapps that were not deleted in Assets Directory. Once they were deleted, I could build on iOS.