Tell user if instance addition fails

Core/Net/Repo.cs

@@ -381,7 +381,7 @@ private static List<CkanModule> UpdateRegistryFromTarGz(string path, out SortedD
                 using (GZipInputStream gzipStream = new GZipInputStream(inputStream))
                 {
                     // Create a handle for the tar stream.
-                    using (TarInputStream tarStream = new TarInputStream(gzipStream))
+                    using (TarInputStream tarStream = new TarInputStream(gzipStream, Encoding.UTF8))
                     {
                         TarEntry entry;
                         while ((entry = tarStream.GetNextEntry()) != null)

GUI/Dialogs/ManageGameInstancesDialog.cs

@@ -108,7 +108,10 @@ private void AddToCKANMenuItem_Click(object sender, EventArgs e)
             {
                 _user.RaiseError(Properties.Resources.ManageGameInstancesNotValid,
                     new object[] { k.path });
-                return;
+            }
+            catch (Exception exc)
+            {
+                _user.RaiseError(exc.Message);
             }
         }
 

Netkan/Validators/VrefValidator.cs

@@ -59,7 +59,7 @@ public void Validate(Metadata metadata)
                         // This means the install stanzas don't match any files.
                         // That's not our problem; someone else will report it.
                     }
-                    catch (Kraken k)
+                    catch (Kraken)
                     {
                         // If FindInternalAvc throws anything else, then there's a version file with a syntax error.
                         // This shouldn't cause the inflation to fail, but it does deprive us of the path.