I am using Chelper plugin with IntelliJ for two months but today when i tried to use it ,I got this message "CHelper: Unable to parse task from json" can any one help me with this?!!

Thank you in advance....

Update:- Jasperr told me the problem and its solution and the plugin worked again.. thank you.

The solution:- See https://github.com/jmerle/competitive-companion/issues/83 . This is a bug in Competitive Companion, not in CHelper. The DOM structure of Codeforces' problem pages changed slightly a few days ago which broke the Codeforces parser in Competitive Companion. The bug fix is already released to Firefox's AMO, but cannot be released to the Chrome Web Store yet. For now either use Firefox or install the extension manually on Chrome, as I have explained in this comment on GitHub https://github.com/jmerle/competitive-companion/issues/26#issuecomment-459992662.