Segment of container doesn't work

Hi, 

The segment of container doesn't work from yesterday. Instead of a result of json as usual, the response is an error "500 Internal Server Error"

Could anyone help me? 

"segments": [{
            "container": {
                "type": "visits",
                "operator": "and",
                "rules": [{
                    "element": "eVar1",
                    "operator": "contains",
                    "value": "vehicles"
                }]
            }
        }]