Ue4 Crashing

Im using UE4.6, doing a blueprint game suddenly while playing in editor it crashes,
it happens when I load level stream. I don’t know what I did wrong 0.0 nothing was deleted or anything like that.

Here’s the error that it generates:

Access violation - code c0000005 (first/second chance not available)

Ensure condition failed: false [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.6\Engine\Source\Runtime\Engine\Private\SceneComponent.cpp] [Line: 760]
Template Mismatch during attachment. Attaching instanced component to template componen

UE4Editor_Engine + 6500582 bytes
UE4Editor_Engine + 5046435 bytes
UE4Editor_Engine + 9772300 bytes
UE4Editor_Engine + 10027069 bytes
UE4Editor_Engine + 10025809 bytes
UE4Editor_Engine + 3543489 bytes
UE4Editor_Engine + 9302478 bytes
UE4Editor_UnrealEd + 1806471 bytes
UE4Editor_UnrealEd + 6686342 bytes
UE4Editor!FEngineLoop::Tick() + 3876 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launchengineloop.cpp:2214]
UE4Editor!GuardedMain() + 479 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\launch.cpp:131]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.6\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Hey -

I noticed that you posted this same question here: Ue4 Crashing - World Creation - Epic Developer Community Forums as well. I am closing this post in order to focus attention to this issue in one place.