Dispose the ProjectChangeWatcher when creating a new project fails.

src/AddIns/BackendBindings/CppBinding/CppBinding/Project/CppProject.cs

@@ -27,6 +27,7 @@ namespace ICSharpCode.CppBinding.Project
 				AddProjectConfigurationsItemGroup();
 				base.ReevaluateIfNecessary(); // provoke exception if import is invalid
 			} catch (InvalidProjectFileException ex) {
+				Dispose();
 				throw new ProjectLoadException("Please ensure that the Windows SDK is installed on your computer.\n\n" + ex.Message, ex);
 			}
 		}

src/AddIns/BackendBindings/FSharpBinding/FSharpProject.cs

@@ -27,6 +27,7 @@ namespace FSharpBinding
 				base.AddImport(@"$(MSBuildExtensionsPath32)\..\Microsoft F#\v4.0\Microsoft.FSharp.Targets", null);
 				base.ReevaluateIfNecessary(); // provoke exception if import is invalid
 			} catch (InvalidProjectFileException ex) {
+				Dispose();
 				throw new ProjectLoadException("Please ensure that the F# compiler is installed on your computer.\n\n" + ex.Message, ex);
 			}
 		}

src/Main/Base/Project/Src/Internal/Templates/Project/ProjectTemplate.cs

@@ -321,6 +321,8 @@ namespace ICSharpCode.SharpDevelop.Internal.Templates
 					}
 					return solutionLocation;
 				} else {
+					if (createNewSolution)
+						projectCreateInformation.Solution.Dispose();
 					return null;
 				}
 			} else {

src/Main/Base/Project/Src/Project/AbstractProject.cs

@@ -53,7 +53,8 @@ namespace ICSharpCode.SharpDevelop.Project
 		public virtual void Dispose()
 		{
 			WorkbenchSingleton.AssertMainThread();
-			watcher.Dispose();
+			if (watcher != null)
+				watcher.Dispose();
 			isDisposed = true;
 			if (Disposed != null) {
 				Disposed(this, EventArgs.Empty);

src/Main/Base/Project/Src/Project/MSBuildBasedProject.cs

@@ -1161,6 +1161,7 @@ namespace ICSharpCode.SharpDevelop.Project
 			} catch (InvalidProjectFileException ex) {
 				LoggingService.Warn(ex);
 				LoggingService.Warn("ErrorCode = " + ex.ErrorCode);
+				Dispose();
 				throw new ProjectLoadException(ex.Message, ex);
 			} finally {
 				isLoading = false;