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Help my editor crashed

I tried to edit the itchy character Bp or dolphin as it is called and replace it with the pufferfish mesh and alimations I made and it crashed. It also crashed if i just simulate the Dolphin_ character_BP Then it also crashes I was wondering if anyone knew why.
The error code was this Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000818

VERSION: 0.0
UE4Editor-ShooterGame.dll!APrimalCharacter::Tick() (0x000007fed97d9668) + 7 bytes [c:\svn_ark\projects\shootergame\source\shootergame\private\primalcharacter.cpp:2280]
UE4Editor-ShooterGame.dll!APrimalDinoCharacter::Tick() (0x000007fed983ae18) + 0 bytes [c:\svn_ark\projects\shootergame\source\shootergame\private\primaldinocharacter.cpp:443]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee24d0aae) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee2487709) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee2c373f1) + 0 bytes [UnknownFile:0]
UE4Editor-Engine.dll!UnknownFunction (0x000007fee2848a06) + 0 bytes [UnknownFile:0]
UE4Editor-Kismet.dll!UnknownFunction (0x000007fede9e405f) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x000007fee0731708) + 0 bytes [UnknownFile:0]
UE4Editor-UnrealEd.dll!UnknownFunction (0x000007fee0b95b36) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f439564) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f42ed0f) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f42ed7a) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f43abe0) + 0 bytes [UnknownFile:0]
UE4Editor.exe!UnknownFunction (0x000000013f43bb19) + 0 bytes [UnknownFile:0]
kernel32.dll!UnknownFunction (0x0000000076fc59ed) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00000000770fb371) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x00000000770fb371) + 0 bytes [UnknownFile:0]