Reminders from GMAIL will not dismiss

Hi there - I am using EM Client version 8.0.3385. I am unable to dismiss gmail calendar reminders for some reason… Window pops up, I hit dismiss, it disappears for a few hours, then pops back up. This happens with about 1/2 dozen different calendar items, and the only way to get it to stop is to go directly to GMAIL and delete the event. Today I got an error message that says "Synchronizing folder list failed due to the following error: Internal error encounter.