Issues on creating assetGroup through REST

['Joseph Chung' via Google Ads API and AdWords API Forum]

I tried creating an assetGroup via REST API on a campaign that was created 
in console, I constantly get the following errors. I used 
POST 
`https://googleads.googleapis.com/v11/customers/{customerId}/assetGroups:mutate`
 
with all required fields from the google document.
 {
                        "errorCode": {
                            "assetGroupError": 
"NOT_ENOUGH_LONG_HEADLINE_ASSET"
                        },
                        "message": "Long headline asset for a valid asset 
group is not enough.",
                        "trigger": {
                            "stringValue": "Asset type: long headline"
                        },
                        "location": {
                            "fieldPathElements": [
                                {
                                    "fieldName": "operations",
                                    "index": 0
                                }
                            ]
                        }
                    },
                    {
                        "errorCode": {
                            "assetGroupError": 
"NOT_ENOUGH_DESCRIPTION_ASSET"
                        },
                        "message": "Description headline asset for a valid 
asset group is not enough.",
                        "trigger": {
                            "stringValue": "Asset type: description"
                        },
                        "location": {
                            "fieldPathElements": [
                                {
                                    "fieldName": "operations",
                                    "index": 0
                                }
                            ]
                        }
                    },

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