Engine Crashes when I press Play (4.8.3)

Hello everyone. A problem has recently sprung up with the development of my game and I was hoping I could get some answers.

A couple days ago, I was working in engine. I closed it to go do something else, and when I opened it back up, I quickly realized that whenever I pressed the play button, the engine would crash. There were no stated errors before this, and nothing like this has happened to me before. If you have any idea about how to fix, please let me know. Thank you.

Here is the information from the crash screen:

Unknown exception - code 00000001 (first/second chance not available)
"Assertion failed: CharacterOwner->GetCapsuleComponent() [File:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\Engine\Private\Components\Ch
UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:355]
UE4Editor_Engine!UCharacterMovementComponent::FindFloor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\components\charactermovementcomponent.cpp:4815]
UE4Editor_Engine!UCharacterMovementComponent::OnMovementModeChanged() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\components\charactermovementcomponent.cpp:710]
UE4Editor_Engine!UCharacterMovementComponent::SetMovementMode() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\components\charactermovementcomponent.cpp:662]
UE4Editor_Engine!UCharacterMovementComponent::SetDefaultMovementMode() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\components\charactermovementcomponent.cpp:625]
UE4Editor_Engine!APawn::PawnClientRestart() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\pawn.cpp:345]
UE4Editor_Engine!APlayerController::ClientRestart_Implementation() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\playercontroller.cpp:738]
UE4Editor_Engine!APlayerController::execClientRestart() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\classes\gameframework\playercontroller.h:149]
UE4Editor_CoreUObject!UFunction::Invoke() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\coreuobject\private\uobject\class.cpp:4125]
UE4Editor_CoreUObject!UObject::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\coreuobject\private\uobject\scriptcore.cpp:1019]
UE4Editor_Engine!AActor::ProcessEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\actor.cpp:520]
UE4Editor_Engine!APlayerController::ClientRestart() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\intermediate\build\win64\ue4editor\inc\engine\engine.generated.1.cpp:3783]
UE4Editor_Engine!APlayerController::Possess() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\playercontroller.cpp:803]
UE4Editor_Engine!ULevel::PushPendingAutoReceiveInput() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\level.cpp:1901]
UE4Editor_Engine!APlayerController::InitInputSystem() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\playercontroller.cpp:657]
UE4Editor_Engine!APlayerController::SetPlayer() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\playercontroller.cpp:3724]
UE4Editor_Engine!UWorld::SpawnPlayActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\levelactor.cpp:599]
UE4Editor_Engine!ULocalPlayer::SpawnPlayActor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\localplayer.cpp:255]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\gameinstance.cpp:249]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\playlevel.cpp:2942]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\playlevel.cpp:2289]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\playlevel.cpp:1005]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\editorengine.cpp:1236]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\unrealedengine.cpp:366]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launchengineloop.cpp:2359]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]