'update' command document too large error message


While trying to save my survey which is not fully complete , This error message pops up. I resorted to trying to create the survey again with a different approach and by page 8 was also hit with this same error page. I am a final year psych student and I really need to have this survey done in time to collect participants by end of march. I would really appreciate any help or advice.

unable to query the surveyModels collection: ‘update’ command document too large
If the error persists, contact Pavlovia’s administrator.

Full description:
{
“origin”: “http://pavlovia.org/api/v2/surveys/4e8fb83a-96ad-4101-b19e-a9f68ef47ba2”,
“context”: “when updating the survey with id: 4e8fb83a-96ad-4101-b19e-a9f68ef47ba2”,
“error”: “unable to query the surveyModels collection: ‘update’ command document too large”,
“errorCode”: 2,
“httpStatusCode”: 500
}