I just installed the latest version of Moodle 2.4 and when uploading files not matter what size they are I am getting the following Json string error. I will really appreciate if some one can give me a hint in how to resolve this issue.
Invalid JSON string
Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, firstname.lastname@example.org and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.