diff --git a/Database/Database.csproj b/Database/Database.csproj
index c7eabe5..e68fd1a 100644
--- a/Database/Database.csproj
+++ b/Database/Database.csproj
@@ -53,6 +53,10 @@
       <Project>{c82bd650-466b-403f-bed9-2b1660771f54}</Project>
       <Name>KlassenBIB</Name>
     </ProjectReference>
+    <ProjectReference Include="..\SanShared\SanShared.csproj">
+      <Project>{c949087e-20e1-4a17-b021-faead363c1d8}</Project>
+      <Name>SanShared</Name>
+    </ProjectReference>
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />
diff --git a/Database/Datenbank.cs b/Database/Datenbank.cs
index 0147ea9..e409062 100644
--- a/Database/Datenbank.cs
+++ b/Database/Datenbank.cs
@@ -10,6 +10,7 @@ using System.Diagnostics;
 using ICSharpCode.SharpZipLib.Zip;
 using ICSharpCode.SharpZipLib.Core;
 using KlassenBIB;
+using SanShared.Exceptions;
 
 namespace Database
 {
@@ -40,7 +41,16 @@ namespace Database
             if (File.Exists(filepath))
             {
                 File.Copy(filepath, string.Format("{0}_{1}_{2}.bak", filepath,DateTime.Now.ToShortDateString(),DateTime.Now.Ticks));
-                loadedProjekt = XamlServices.Load(filepath) as KlassenBIB.Projekt;
+                try
+                {
+                    loadedProjekt = XamlServices.Load(filepath) as KlassenBIB.Projekt;
+                }
+                catch(XamlObjectWriterException ex)
+                {
+                    string msg = ex.Message;
+                    if (msg.ToLower().Contains("kann nicht festgelegt werden"))
+                        throw new DataBaseVersionMismatchException();
+                }
             }
             else
                 loadedProjekt = new KlassenBIB.Projekt();
diff --git a/SanShared/Exceptions/DataBaseVersionMismatchException.cs b/SanShared/Exceptions/DataBaseVersionMismatchException.cs
new file mode 100644
index 0000000..a04f7a1
--- /dev/null
+++ b/SanShared/Exceptions/DataBaseVersionMismatchException.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SanShared.Exceptions
+{
+    public class DataBaseVersionMismatchException : Exception
+    {
+        public DataBaseVersionMismatchException()
+        {
+        }
+
+        public DataBaseVersionMismatchException(string message) : base(message)
+        {
+        }
+
+        public DataBaseVersionMismatchException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected DataBaseVersionMismatchException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+}
diff --git a/SanShared/SanShared.csproj b/SanShared/SanShared.csproj
index a790043..d7dc0b8 100644
--- a/SanShared/SanShared.csproj
+++ b/SanShared/SanShared.csproj
@@ -42,6 +42,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="BilderObject.cs" />
+    <Compile Include="Exceptions\DataBaseVersionMismatchException.cs" />
     <Compile Include="Exceptions\LangNotFoundException.cs" />
     <Compile Include="IAuftraggeber.cs" />
     <Compile Include="ILanguage.cs" />
diff --git a/SanSystem/frmMain.cs b/SanSystem/frmMain.cs
index b9dcb6d..bb18266 100644
--- a/SanSystem/frmMain.cs
+++ b/SanSystem/frmMain.cs
@@ -1,6 +1,7 @@
 using Database;
 using FluentFTP;
 using KlassenBIB;
+using SanShared.Exceptions;
 using SchnittstelleImporter;
 using System;
 using System.Collections.Generic;
@@ -31,8 +32,15 @@ namespace SanSystem
             //Global.Instance.
             
             if (!Directory.Exists(Global.Instance.Projektpfad)) Directory.CreateDirectory(Global.Instance.Projektpfad);
-            Datenbank.Instance.LoadProjekt(Global.Instance.ProjektNummer, Global.Instance.Projektpfad);//     Path.Combine(Global.Instance.Projektpfad,"18-850.xaml"));
-
+            try
+            {
+                Datenbank.Instance.LoadProjekt(Global.Instance.ProjektNummer, Global.Instance.Projektpfad);//     Path.Combine(Global.Instance.Projektpfad,"18-850.xaml"));
+            }
+            catch(DataBaseVersionMismatchException)
+            {
+                MessageBox.Show("Database version mistmatch\nProgramm wird beendet");
+                Environment.Exit(0);
+            }
            
             //Datenbank.Instance.CreateProjekt("");
             this.Width = Screen.PrimaryScreen.WorkingArea.Width;