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>