Can't add Dashboard via HTTP API

Hello, I’ve been trying to add a dashboard via HTTP API. The only thing I did was getting a JSON model from an already made fully functioning dashboard (changed a few obvious things like uid, etc.), and then when I try adding it via API I get the following response:

[{“classification”:“DeserializationError”,“message”:“invalid character ‘s’ looking for beginning of value”},{“fieldNames”:[“Dashboard”],“classification”:“RequiredError”,“message”:“Required”}]

What am I doing wrong?