The message indicates that the device you are working on does not have enough memory capacity to open the lesson file.
- On which device are you working? The memory is different on each device. We advise you to check if the file opens on another device with more memory.
- How large is your lesson file? This is not just the number of pages, but also the number of objects on a page. It may be an option to split your lesson file into several small files. If you see the 'Out of memory' message appear immediately after opening, it is also possible to have this split carried out by our service department.