message: notify when migration fails
diff: @@ -86,7 +86,15 @@ export function loadProject(project, file) {
  if (/\.side$/.test(file.name)) {
  loadJSONProject(project, e.target.result);
  } else if (file.type === "text/html") {
  + try {
  project.fromJS(migrateProject(e.target.result));
  + } catch (error) {
  + ModalState.showAlert({
  + title: "Error migrating project",
  + description: error.message,
  + confirmLabel: "Close"
  + });
  + }
  }
  };
  