Issue Constant page refreshments (Plesk Premium Email - Roundcube - Calendar)

[Cosmin Catalin]

Hello, I have purchased the Premium email license for the emails but on the calendar every time I go, the page is updated every second by setting the following error:

Forbidden
?_task=calendar&_action=count&source[]=--invitation--pending&_remote=1&_unlock=0&_=1555437984594

Screenshot


Can somebody help me?