I have a error please help

This is my error please help me fix

<RuntimeProperties>
	<CrashVersion>3</CrashVersion>
	<CrashGUID>_0000</CrashGUID>
	<ProcessId>1964</ProcessId>
	<IsInternalBuild>false</IsInternalBuild>
	<IsPerforceBuild>false</IsPerforceBuild>
	<IsSourceDistribution>false</IsSourceDistribution>
	<IsEnsure>false</IsEnsure>
	<IsAssert>true</IsAssert>
	<CrashType>Assert</CrashType>
	<SecondsSinceStart>0</SecondsSinceStart>
	<GameName />
	<ExecutableName />
	<BuildConfiguration>Shipping</BuildConfiguration>
	<GameSessionID />
	<PlatformName />
	<PlatformNameIni />
	<EngineMode>Game</EngineMode>
	<EngineModeEx>Unset</EngineModeEx>
	<DeploymentName />
	<EngineVersion>4.19.0-3870737+++Fortnite+Release-Next</EngineVersion>
	<CommandLine />
	<LanguageLCID>0</LanguageLCID>
	<AppDefaultLocale />
	<BuildVersion>++Fortnite+Release-Next-CL-3870737</BuildVersion>
	<IsUE4Release>false</IsUE4Release>
	<UserName>Simon</UserName>
	<BaseDir />
	<RootDir />
	<MachineId />
	<LoginId>04b71fb24056ebafd9b39cbee5aa275c</LoginId>
	<EpicAccountId>15c2557b764e4140a7139234a230bed9</EpicAccountId>
	<CallStack />
	<SourceContext />
	<UserDescription />
	<UserActivityHint />
	<ErrorMessage>Fatal error: [File:Unknown] [Line: 3897] Corrupted index in pak file (CRC mismatch).</ErrorMessage>
	<CrashDumpMode>0</CrashDumpMode>
	<CrashReporterMessage />
	<Misc.NumberOfCores>0</Misc.NumberOfCores>
	<Misc.NumberOfCoresIncludingHyperthreads>0</Misc.NumberOfCoresIncludingHyperthreads>
	<Misc.Is64bitOperatingSystem>1</Misc.Is64bitOperatingSystem>
	<Misc.CPUVendor />
	<Misc.CPUBrand />
	<Misc.PrimaryGPUBrand />
	<Misc.OSVersionMajor />
	<Misc.OSVersionMinor />
	<GameStateName />
	<MemoryStats.TotalPhysical>8503078912</MemoryStats.TotalPhysical>
	<MemoryStats.TotalVirtual>8796092891136</MemoryStats.TotalVirtual>
	<MemoryStats.PageSize>4096</MemoryStats.PageSize>
	<MemoryStats.TotalPhysicalGB>8</MemoryStats.TotalPhysicalGB>
	<MemoryStats.AvailablePhysical>2809278464</MemoryStats.AvailablePhysical>
	<MemoryStats.AvailableVirtual>8795897643008</MemoryStats.AvailableVirtual>
	<MemoryStats.UsedPhysical>106659840</MemoryStats.UsedPhysical>
	<MemoryStats.PeakUsedPhysical>106659840</MemoryStats.PeakUsedPhysical>
	<MemoryStats.UsedVirtual>117624832</MemoryStats.UsedVirtual>
	<MemoryStats.PeakUsedVirtual>117628928</MemoryStats.PeakUsedVirtual>
	<MemoryStats.bIsOOM>0</MemoryStats.bIsOOM>
	<MemoryStats.OOMAllocationSize>0</MemoryStats.OOMAllocationSize>
	<MemoryStats.OOMAllocationAlignment>0</MemoryStats.OOMAllocationAlignment>
	<TimeOfCrash>636533081706020000</TimeOfCrash>
	<bAllowToBeContacted>1</bAllowToBeContacted>
	<PlatformFullName />
	<CrashReportClientVersion>1.0</CrashReportClientVersion>
</RuntimeProperties>
<PlatformProperties>
	<PlatformIsRunningWindows>1</PlatformIsRunningWindows>
	<PlatformCallbackResult>0</PlatformCallbackResult>
</PlatformProperties>