Error on assignments

The following error appears when creating the JSON file.
```
The server replied: {"message":"","statusCode":404}
Could not download programming assignment Rqh9M: 404 Client Error: Not Found for url: https://api.coursera.org/api/onDemandProgrammingLearnerAssignments.v1/hD8t4jWeEeu9vAr5jUgnDQ~Rqh9M?fields=submissionLearnerSchema
```