PowerBI Create Dataset from a Postgresql datasource using REST API - api

Question

I created a datasource behind gateway for using rest API. Datasource got created. However, now I want to add a table(create a dataset) from the created datasource to use it in a report. However, I am getting the below error from API.
{
"error": {
"code": "FailedToDeserializeDatasetError",
"pbi.error": {
"code": "FailedToDeserializeDatasetError",
"parameters": {},
"details": [],
"exceptionCulprit": 1
}
}
}
API request body:
{
"datasources": [
{
"gatewayId":"gateway_id",
"datasourceId": "datasource_id",
"datasourceType": "PostgreSql",
"connectionDetails": "{\"server\":\"server_address\",\"database\":\"database_name\"}",
"credentialType": "Basic",
"credentialDetails": {
"privacyLevel": "None",
"useEndUserOAuth2Credentials": false
}
}
],
"defaultMode": "Push",
"name": "API DS 1",
"tables": [
{
"name":"currency_rates",
"description": "DS Table 1 Demo API",
"columns":[
{
"name":"id",
"dataType":"Int64"
},
{
"name":"traded_on",
"dataType":"DateTime"
},
{
"name":"currency_code",
"dataType": "string"
},
{
"name":"close",
"dataType": "Double"
}
]
}
]
}
Not sure what is wrong here.
API Reference: https://learn.microsoft.com/en-us/rest/api/power-bi/push-datasets/datasets-post-dataset-in-group