Data Syncroizing is broken

Since yesterday the data syncronization is broken. If I start a full sync it counts the posts to syncronize, but it dosn’t sync any data.
I deleted and reinstalled the new plugin, set up a new google analytics connection – no change.
I didn’t change anything on blog since yesterdan.
Thanks for your help.

https://ww.wp.xz.cn/plugins/social-metrics-tracker/