Error encountered by JSON parser: Unterminated string

Hi,

I am having this problem when trying to add more than 9 "rows" in a single POST to the REST API, and which accordingly with the limitations that should not be a problem

https://api.powerbi.com/v1.0/myorg/datasets/{dataset_id}/tables/{table_name}/rows

This is the error I am getting after the request data is sent:

{"error":{"code":"InvalidRequest","message":"Error parsing request for dataset sobe_wowvirtualserver|01fecc15-5954-4c6b-bbb2-d89b29bc43ca: Error encountered by JSON parser: Unterminated string. Expected delimiter: \". Path 'rows[9].Cobertura', line 1, position 3780."}}

 Any ideas?

best regards,

Ramon