Can you translate that to English for us, please?
If you provide the error message text as well, and not just the image, it can also be auto-translated.
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Revit encountered System.TypeLoadException: Could not load type 'System.Reflection.MemberInfo' from assembly 'System.Runtime, Version = 4.0.0.0, Culture = neutral, PublicKeyToken = b03f5f7ff11d50a3a'. In _22_DbElement.DBElement.ShowBasicElementInfo (element element) in _22_DbElement.DBElement.Execute (ExternalCommandData commandData, String & message, ElementSet elements) in apiMangedExecuteCommand (ASTring * assemblyName, * ASName * assemblyName * message, Set <ElementId \, std :: less <AString> \, tnallc <std :: pair <AString const \, AString >>> * data, AString * exceptionName, AString * exceptionMessage
I also need to understand why when setting breakpoints in the body of the code during debugging, they do not stop?