diff --git a/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementExistsException.cs b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementExistsException.cs
new file mode 100644
index 0000000..2ad3aaf
--- /dev/null
+++ b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementExistsException.cs
@@ -0,0 +1,14 @@
+namespace CatHasPawsContratcs.Exceptions;
+
+public class ElementExistsException : Exception
+{
+	public string ParamName { get; private set; }
+
+	public string ParamValue { get; private set; }
+
+	public ElementExistsException(string paramName, string paramValue) : base($"There is already an element with value{paramValue} of parameter {paramName}")
+	{
+		ParamName = paramName;
+		ParamValue = paramValue;
+	}
+}
diff --git a/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementNotFoundException.cs b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementNotFoundException.cs
new file mode 100644
index 0000000..a6775f5
--- /dev/null
+++ b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/ElementNotFoundException.cs
@@ -0,0 +1,11 @@
+namespace CatHasPawsContratcs.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+	public string Value { get; private set; }
+
+	public ElementNotFoundException(string value) : base($"Element not found at value = {value}")
+	{
+		Value = value;
+	}
+}
\ No newline at end of file
diff --git a/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/IncorrectDatesException.cs b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/IncorrectDatesException.cs
new file mode 100644
index 0000000..4b9e71b
--- /dev/null
+++ b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/IncorrectDatesException.cs
@@ -0,0 +1,6 @@
+namespace CatHasPawsContratcs.Exceptions;
+
+public class IncorrectDatesException : Exception
+{
+	public IncorrectDatesException(DateTime start, DateTime end) : base($"The end date must be later than the start date.. StartDate: {start:dd.MM.YYYY}. EndDate: {end:dd.MM.YYYY}") { }
+}
diff --git a/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/NullListException.cs b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/NullListException.cs
new file mode 100644
index 0000000..9de85e0
--- /dev/null
+++ b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/NullListException.cs
@@ -0,0 +1,6 @@
+namespace CatHasPawsContratcs.Exceptions;
+
+public class NullListException : Exception
+{
+	public NullListException() : base("The returned list is null") { }
+}
diff --git a/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/StorageException.cs b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/StorageException.cs
new file mode 100644
index 0000000..714e4f2
--- /dev/null
+++ b/TheCatHasPawsProject/CatHasPawsContratcs/Exceptions/StorageException.cs
@@ -0,0 +1,6 @@
+namespace CatHasPawsContratcs.Exceptions;
+
+public class StorageException : Exception
+{
+	public StorageException(Exception ex) : base($"Error while working in storage: {ex.Message}", ex) { }
+}
\ No newline at end of file