I would like to open a map in the mindmap cloud on my ipad but it says that the maps is damaged

I would like to open a map in the mindmap cloud on my ipad but it says that the maps is damaged. This is strange because when I open the map on my computer it works just fine. Another map that I have worked on recently and also stored in the mindmap cloud works well on my computer and the ipad. How can I fix this issue? Is it really tha map that is damaged or is this a synchronisation issue?.