When I click Import appears Missing IImportExportService.

[shipeichong]

Why do I prompt me with this error message when I click the import? What should I do to use it? It tells me that there is a trial license. Is this available after paying?
What should I do to use the import function？

[Oleg]

Hello.
Your license key is not installed in ZModeler.
You need to install license key and restart ZModeler.
It is strongly advised to run ZModeler as Administrator. Otherwise, ZModeler might be unable to saved license key on a hard drive, while it is essential to run properly.