Unable to start Pkhex shows error!

[PkGamer009]

Exception Details:
System.MissingMethodException: Method not found: 'Void PKHeX.Core.SaveDataEditor`1..ctor(PKHeX.Core.SaveFile, PKHeX.Core.IPKMView)'.
   at PKHeX.WinForms.Main..ctor()
   at PKHeX.WinForms.Program.Main()

Loaded Assemblies:
--------------------
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll

PKHeX, Version=19.11.15.0, Culture=neutral, PublicKeyToken=null
C:\Users\Austin Moua\Desktop\PKHeX.exe

System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll

System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Windows.Forms\v4.0_4.0.0.0__b77a5c561934e089\System.Windows.Forms.dll

System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Drawing\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll

PKHeX.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
C:\Users\Austin Moua\Desktop\PKHeX.Core.dll

System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll

System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Core\v4.0_4.0.0.0__b77a5c561934e089\System.Core.dll

System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Xml\v4.0_4.0.0.0__b77a5c561934e089\System.Xml.dll

--------------------
User Message:
An unhandled exception has occurred.
PKHeX must now close.
 

[theSLAYER]

@PkGamer009 read this:

50 minutes ago, Kaphotics said:

Don't mix and match releases.

Delete the old PKHeX.Core.dll from the folder the exe is in.

 

[PkGamer009]

ah! thank you.