About fatal error

Development Getting Started & Setup
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1

My level crashed when importing assets, the log shows as follows:
LoginId:247abc3b40c9abc29fa0e383d818cf83
EpicAccountId:636ea2bcc98849bdba8250a3551c867e

Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/LinkerLoad.cpp] [Line: 4148] StaticMeshComponent /Game/18.18:PersistentLevel.Subdivision_Surface_1_2.StaticMeshComponent0: Serial size mismatch: Got 62865775, Expected 20947041

UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_CoreUObject
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowserAssetDataSource
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_ContentBrowser
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_Slate
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
UE4Editor_ApplicationCore
user32
user32
UE4Editor_ApplicationCore
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll