Import and conversion 
Автор: LaVon Thurston
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this is the message i got when i went through the process
loading from WebSite X5 Evolution 10 to WebSite X5 Professional 13
An error occurred while loading the project.
(Object reference not set to an instance of an object.)
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This means some object in Evo 10 is in a different object in Pro 13. As an example, any 360 rotation in the gallery object is Version 11 and below are in separate objects in Version 13. To fix this you will need to find the offending object, and remove it from Evo 10 so Pro 13 and import the project.