Unreal Crashing (urgent deadline)

Hello,

My unreal project opens but any action causes it to crash. I have uploaded an image of the crash reporter, any help would be greatly appreciated. Is there something in the crash reporter that identifies the problem. Are there project setting I can change to lower the strain on my IMAC. Should I delete scene elements externally?

I am using a:

iMac (Retina 5K, 27-inch, Late 2015)
4 GHz Quad-Core Intel Core i7
16 GB 1867 MHz DDR3
AMD Radeon R9 M390 2 GB

Crash Report:
LoginId:6c14250e78424cbc2c43819cd57a93cc
EpicAccountId:182c0f75260841ff80acbb6706dcf1ae

Fatal error: [File:/Users/build/Build/++UE4/Sync/Engine/Source/Runtime/Apple/MetalRHI/Private/MetalCommandList.cpp] [Line: 176] Command Buffer TAA MainUpsampling 1138x644 → 1138x644 Failed with Internal Error! Error Domain: MTLCommandBufferErrorDomain Code: 1 Description Internal Error (IOAF code 1) Unknown Unknown

FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x10e19e007 (filename not found) [in UE4Editor-Core.dylib]
FMacErrorOutputDevice::Serialize(char16_t const*, ELogVerbosity::Type, FName const&) Address = 0x10e357dc3 (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::LogfImpl(char16_t const*, …) Address = 0x10e4716c9 (filename not found) [in UE4Editor-Core.dylib]
auto ReportMetalCommandBufferFailure(mtlpp::CommandBuffer const&, char16_t const*, bool)::$_19::operator()<FLogCategoryLogMetal, char16_t [87], char16_t const*, char16_t const*, char16_t const*, int, char16_t const*, char16_t const*, char16_t const*>(FLogCategoryLogMetal const&, char16_t const (&) [87], char16_t const* const&, char16_t const* const&, char16_t const* const&, int const&, char16_t const* const&, char16_t const* const&, char16_t const* const&) const Address = 0x14b9e1e4c (filename not found) [in UE4Editor-MetalRHI.dylib]
ReportMetalCommandBufferFailure(mtlpp::CommandBuffer const&, char16_t const*, bool) Address = 0x14b9ad636 (filename not found) [in UE4Editor-MetalRHI.dylib]
MetalCommandBufferFailureInternal(mtlpp::CommandBuffer const&) Address = 0x14b9e14cc (filename not found) [in UE4Editor-MetalRHI.dylib]
HandleMetalCommandBufferError(mtlpp::CommandBuffer const&) Address = 0x14b9abeef (filename not found) [in UE4Editor-MetalRHI.dylib]
HandleAMDMetalCommandBufferError(mtlpp::CommandBuffer const&) Address = 0x14b9abe35 (filename not found) [in UE4Editor-MetalRHI.dylib]
FMetalCommandList::HandleMetalCommandBufferFailure(mtlpp::CommandBuffer const&) Address = 0x14b9abc68 (filename not found) [in UE4Editor-MetalRHI.dylib]
invocation function for block in FMetalCommandList::Commit(mtlpp::CommandBuffer&, TArray<ns::Object<void (mtlpp::CommandBuffer const&) block_pointer, (ns::CallingConvention)1>, TSizedDefaultAllocator<32> >, bool, bool) Address = 0x14b9ade9e (filename not found) [in UE4Editor-MetalRHI.dylib]
invocation function for block in mtlpp::CommandBuffer::AddCompletedHandler(void (mtlpp::CommandBuffer const&) block_pointer) Address = 0x14b968a00 (filename not found) [in UE4Editor-MetalRHI.dylib]
Unknown() Address = 0x7fff28356292 (filename not found) [in Metal]
Unknown() Address = 0x7fff283567ad (filename not found) [in Metal]
Unknown() Address = 0x7fff28356549 (filename not found) [in Metal]
Unknown() Address = 0x7fff28356442 (filename not found) [in Metal]
Unknown() Address = 0x7fff2835635c (filename not found) [in Metal]
Unknown() Address = 0x7fff2832ecd6 (filename not found) [in IOAccelerator]
Unknown() Address = 0x7fff22b6d6cb (filename not found) [in IOKit]
Unknown() Address = 0x7fff22b6d54c (filename not found) [in IOKit]
Unknown() Address = 0x7fff202202f8 (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff20207806 (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff2020a1b0 (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff2021a564 (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff2020d493 (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff2020e0ad (filename not found) [in libdispatch.dylib]
Unknown() Address = 0x7fff20217c0d (filename not found) [in libdispatch.dylib]
_pthread_wqthread Address = 0x7fff203ae45d (filename not found) [in libsystem_pthread.dylib]
start_wqthread Address = 0x7fff203ad42f (filename not found) [in libsystem_pthread.dylib]

Thank you for your help, my deadline is quite urgent.

James