Sync problem with constant error message

Keep getting this error message. Driving me nuts! Anyone know how to fix this? Error message below.

“[Google Calendar]Uploading item(s) to folder ‘martinruk6@gmail.com/Martins’ failed due to the following error: Value cannot be null. (Parameter ‘value’)”

Hello,
You should not leave your address visible. Indicate for example my.address@gmail.com
In eM Client, did you just set a calendar account my.address@gmail.com?