Tried to import some test users, had some issues with unicode so i tried some different csv files. All is good for an hour but then the module stop working, pressing next after selecting a import file and the module says:

"DotNetNuke.Services.Exceptions.ModuleLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DataSprings.DNN.Modules.UserImport.UserImport.LoadImportFile() --- End of inner exception stack trace ---"

Uninstall the module on the page and installed it again without luck, same error when i press "next".

DNN 482 and import 1.5.20

Any ideas?

Got it to work, the problem was the import file. Dont understand exactly what was the error but did another csv file from another exporter and it worked.

found the error, if a file have txt ending it gives that error message, a file named csv works.