When creating and editing project, you will certainly get error while debugging it. Program shows information about execution in log which will help you to fix errors and correct actions.

If any error occurs during execution, it will be displayed as red alert in log.

You should just double click line with error to focus related action in project scheme. Or you can copy action ID clicking right mouse button on error (the same for ZennoPoster) and find related action using search option in Advanced Editor.

After that you will be able to correct actions with errors and finish your project.