Error

Try checking the folder permissions that NicePage uses.

*Navigate to that folder
*right-click -> properties
*go to the Security tab
*click Edit
*Give your user Full Control

I'm assuming you are using Windows.
For me the export path is C:\Users\OneDrive\Documents\NicePage Templates.
I may need permissions to other paths too, I'm new to NicePage and not 100% familiar with the paths it uses.