Dear Mateo,
This error shows a communication problem. I can describe the symptom but not the problem reason.
A POST HTTP request commonly contents a header parameter that indicates the size of the payload. This error shows that the size of the payload found differs from the size indicated in the header parameter. In this case, there is no header parameter.
It seems that something (between the Browser and the Moodle server) is removing the header with the payload size.
I don't know the reason. But I would check the following:
- The PC has a virus.
- You are using a buggy proxy.
- You are using a buggy antivirus.
- You are not using HTTPS connections.
I was talking with the student, and the problem is that last week she has installed Netbeans and some Java packages, it could be the problem. with this information, can we do something? Thanks for help