I have a string like this:
s = u\"\"\"{\"desc\": \"\\u73cd\\u54c1\\u7f51-\\u5168\\u7403\\u6f6e\\u6d41\\u5962\\u54c1\\u7f51\\u7edc\\u96f6\\u552e\\u5546
In some cases, this error will be raised when the file actually contains a string with a whitespace in it. Deleting the whitespace will solve the problem.