I just installed eM and it seems to workf fine, but when I try to check my calendar it tells me an error ‘system.invalidtimezoneexception’.

I have a gemail account with IMAP. contact and mails works fine but calendar.

some suggestion?

Hi, what version of eM Client are you currently using? Can you try right clicking your calendar folder and select, Properties > Repair, and click on the repair button if it solves the issue?
Can you make a screenshot of the error you’re seeing as well?

Thank you,