fixed bad merge of Error.cs in build

Author: ericnewton76

src/CommandLine/Error.cs

@@ -64,7 +64,8 @@ public enum ErrorType
         /// <summary>
         /// Value of <see cref="CommandLine.SetValueExceptionError"/> type.
         /// </summary>
-        SetValueExceptionError
+        SetValueExceptionError,
+        
         VersionRequestedError,
         /// <summary>
         /// Value of <see cref="CommandLine.InvalidAttributeConfigurationError"/> type.