Fixed SD2-577: System.ArgumentException: Value does not fall within the expected range

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@817 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

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

@@ -321,6 +321,11 @@ namespace ICSharpCode.SharpDevelop.Project
 			}
 			psi.Arguments = StringParser.Parse(this.StartArguments);
 			
+			if (!File.Exists(psi.FileName)) {
+				MessageService.ShowError(psi.FileName + " does not exist and cannot be started.");
+				return;
+			}
+			
 			if (withDebugging) {
 				DebuggerService.CurrentDebugger.Start(psi);
 			} else {