Calendar problem in version 5.0.17211.0

Hi, with the new version of eM Client (5.0.17211.0) I’ve some problems in Calendar tab. When I try to change the calendar color the program return an error

MailExceptions.OperationException: Creazione o aggiornamento della cartella ‘xxx@yyy.com/xxx@yyy/’ fallito con un errore: Object reference not set to an instance of an object. —> System.NullReferenceException: Object reference not set to an instance of an object.

So, also when I try to repair a calendar I get the same error message.

Thank you in advance.

Nicola

Could you copy the whole log please (from the Logs tab in the Operations window) and send it to dev@emclient.com or paste it here? Thanks.