diff --git a/API_SQLuedo/Dto/BlackListDTO.cs b/API_SQLuedo/Dto/BlackListDTO.cs
index 913aaa0..a8a5a63 100644
--- a/API_SQLuedo/Dto/BlackListDTO.cs
+++ b/API_SQLuedo/Dto/BlackListDTO.cs
@@ -5,6 +5,7 @@ public class BlackListDTO
     public string Email { get; set; }
     public DateOnly ExpirationDate { get; set; }
 
+    public BlackListDTO() {}
     public BlackListDTO(string email, DateOnly expirationDate)
     {
         Email = email;
diff --git a/API_SQLuedo/Dto/InquiryDTO.cs b/API_SQLuedo/Dto/InquiryDTO.cs
index 5a436ed..f734ce7 100644
--- a/API_SQLuedo/Dto/InquiryDTO.cs
+++ b/API_SQLuedo/Dto/InquiryDTO.cs
@@ -10,6 +10,7 @@ public class InquiryDTO
 
     public bool IsUser { get; set; }
 
+    public InquiryDTO(){}
     public InquiryDTO(int id, string title, string description, bool isUser)
     {
         Id = id;
diff --git a/API_SQLuedo/Dto/ParagraphDTO.cs b/API_SQLuedo/Dto/ParagraphDTO.cs
index f6925dd..13c702f 100644
--- a/API_SQLuedo/Dto/ParagraphDTO.cs
+++ b/API_SQLuedo/Dto/ParagraphDTO.cs
@@ -29,9 +29,9 @@ public class ParagraphDTO : ContentLessonDTO
         Info = info;
         Query = query;
         Comment = comment;
-    }
-
-    public ParagraphDTO() : base()
-    {
-    }
+    }
+
+    public ParagraphDTO() : base()
+    {
+    }
 }
\ No newline at end of file