Anyhow(JSON error: expected value at line 1 column 1, please double check your session and csrf config.)

So i have the latest csrf and lession configured to leetcode.toml, and I was running automated submission to leetcode using "leetcode exec $qid", for after about 30 mins, all my submission was getting the above error message. 

Would be nice if i can be explained to why the above error keeps happening. My guess is the anti-scrape policy from leetcode.com?