My S Planner data is gone after rebooting, how can I get all of my data back?

[AC Question]

s planner all data gone after reboot

Hello, I did a reboot on my samsung s5 mini. before that I did a sync on my s planner to save my data. it usally syncs with my google calendar. after the reboot I tried to restore my data but all data was gone. can't find it in s planner and google calendar either. please help!!!