LowLevelFatalError class mismatch

Please! Whenever I try to get into the map, normally the loading screen shows up and after that im loaded into the map.

But after I packaged the project, i got this error

PLEASE, can someone help me figure this out?

REPORT:

LowLevelFatalError [File:D:\Build++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp] [Line: 1926]
FAsyncPackage::FindExistingImport class mismatch FileMediaSource != SoundWave

KERNELBASE.dll!0x00000000AB19A388
Projekt_Explodus-Win64-Shipping.exe!0x000000001259EF9B
Projekt_Explodus-Win64-Shipping.exe!0x00000000125B53A8
Projekt_Explodus-Win64-Shipping.exe!0x00000000127CA924
Projekt_Explodus-Win64-Shipping.exe!0x00000000127D2B6D
Projekt_Explodus-Win64-Shipping.exe!0x00000000127C9B5F
Projekt_Explodus-Win64-Shipping.exe!0x00000000127BD8FF
Projekt_Explodus-Win64-Shipping.exe!0x00000000127D4ECC
Projekt_Explodus-Win64-Shipping.exe!0x00000000127D7513
Projekt_Explodus-Win64-Shipping.exe!0x00000000127E35DB
Projekt_Explodus-Win64-Shipping.exe!0x00000000127E2B77
Projekt_Explodus-Win64-Shipping.exe!0x00000000127CD4C5
Projekt_Explodus-Win64-Shipping.exe!0x00000000127A9C92
Projekt_Explodus-Win64-Shipping.exe!0x00000000127A99D6
Projekt_Explodus-Win64-Shipping.exe!0x0000000012F62994
Projekt_Explodus-Win64-Shipping.exe!0x0000000012F50508
Projekt_Explodus-Win64-Shipping.exe!0x0000000012F6B392
Projekt_Explodus-Win64-Shipping.exe!0x0000000013010343
Projekt_Explodus-Win64-Shipping.exe!0x00000000125816BF
Projekt_Explodus-Win64-Shipping.exe!0x000000001258658C
Projekt_Explodus-Win64-Shipping.exe!0x00000000125865EA
Projekt_Explodus-Win64-Shipping.exe!0x000000001258C7E0
Projekt_Explodus-Win64-Shipping.exe!0x00000000143CF55F
KERNEL32.DLL!0x00000000AE433034
ntdll.dll!0x00000000AEE01471
ntdll.dll!0x00000000AEE01471

Fixed, on BeginPlay I had a key mapping in blueprint but that key mapping was already done. After removing that part it works