(Solved) Fail to access my report under menu Report

Dear All,

I dont know why I can’t access my report suddenly. I checked all logs which seems normal except apache log.
And this error occurred for few user only.
Anyone can help or give me some tips for this issue, many thanks!!

playsms_version | 1.4

xxx.xxx.xxx.xxx - - [15/Nov/2016:01:22:20 +0800] “GET /websms/index.php?app=main&inc=feature_report&route=user HTTP/1.1” 500 - “-” “Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36”