Beginning validation...
ec) EXCEPTION CONTEXT
ERROR
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Crusader Kings II\common\objectives\'.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileSystemEnumerableIterator`1.CommonInit()
at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler)
at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)
at System.IO.Directory.InternalGetFiles(String path, String searchPattern, SearchOption searchOption)
at Audax.Clausewitz.IO.C2.Clausewitz2ModPathResolver.GetFilesInternal(DirectoryPath path, String searchPattern, SearchOption searchOption)
at Audax.Clausewitz.IO.C2.Clausewitz2ModPathResolver.GetFiles(DirectoryPath path, String searchPattern, SearchOption searchOption)
at Audax.Clausewitz.IO.CDirectoryPath.GetFiles(String searchPattern, SearchOption searchOption)
at Audax.Clausewitz.IO.CDirectory.GetFiles(CDirectoryPath path, String searchPattern, SearchOption searchOption)
at Audax.Clausewitz.IO.CDirectory.GetFiles(CDirectoryPath path, String searchPattern)
at Audax.Validator.Clausewitz.Ck2.PlotFactory.LoadDefaultConstraints()
at Audax.Validator.TypeCore.ConstraintPrevalidation.<OnPrevalidation>b__1(KeyValuePair`2 fac)
at System.Linq.Enumerable.<SelectManyIterator>d__31`3.MoveNext()
at Audax.Validator.TypeCore.ConstraintPrevalidation.OnPrevalidation(Context c, Scope scope)
at Audax.Validator.GameValidator.Validate(Action onEachValidatorCompleteAction)
Looks to me like you're looking for an objectives folder, while the game has none.