please help me about the login problem, show me "Could not load file or assembly 'Wp"

Mu online season 21 - grand opening

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please help me about the login problem, show me "Could not load file or assembly 'Wp"

when i try to open the client.exe, it shows me a c# error, and the following is details. But i update the latest .net environment, and also the directX runtime, but it doesn't work.
please help me.:witless::witless::witless:


see the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.


************** Exception Text **************
System.IO.FileNotFoundException: Could not load file or assembly 'WpfCustomControlLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'WpfCustomControlLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'