Get invalid parameter when trying to create a webhook

I’m trying to create a webhook and get this error msg:

{"error":{"type":"INVALID_REQUEST_UNKNOWN","message":"Invalid request: parameter validation failed. Check your request data."}}

This is the log of my request:

← “POST /v0/bases/appXXXX/webhooks HTTP/1.1\r\nContent-Type: text/json\r\nAuthorization: Bearer keyXXXXX\r\nAccept-Encoding: gzip;q=1.0,deflate;q=0.6,identity;q=0.3\r\nAccept: /\r\nUser-Agent: Ruby\r\nConnection: close\r\nHost: api.airtable.com\r\nContent-Length: 237\r\n\r\n”

← “{“specification”:”{\“options\”: {\“filters\”: {\“dataTypes\”: [\“tableData\” ], \“recordChangeScope\”: \“tblxXXXXX\\”}}}\”,\”notificationUrl”:"https://XXXXX/air_table/75d5f34b-d96d-4dab-8314-bbae8d1ca82b/ping"}"

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