Fixed SD2-1208: Exception is thrown at #D startup if AddIn files cannot be found.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2107 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Core/Project/Src/AddInTree/AddInTree.cs

@@ -292,7 +292,14 @@ namespace ICSharpCode.Core
 				try {
 					addIn = AddIn.Load(fileName);
 				} catch (AddInLoadException ex) {
-					MessageService.ShowError(ex, "Error loading AddIn " + fileName);
+					LoggingService.Error(ex);
+					if (ex.InnerException != null) {
+						MessageService.ShowError("Error loading AddIn " + fileName + ":\n"
+						                         + ex.InnerException.Message);
+					} else {
+						MessageService.ShowError("Error loading AddIn " + fileName + ":\n"
+						                         + ex.Message);
+					}
 					addIn = new AddIn();
 					addIn.CustomErrorMessage = ex.Message;
 				}