The problem is that you are placing the ListView inside a Column/Row. The text in the exception gives a good explanation of the error.
To avoid the error you need to provide a size to the ListView inside.
I propose you this code that uses an Expanded to inform the horizontal size (maximum available) and the SizedBox (Could be a Container) for the height:
new Row(
children: <Widget>[
Expanded(
child: SizedBox(
height: 200.0,
child: new ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: products.length,
itemBuilder: (BuildContext ctxt, int index) {
return new Text(products[index]);
},
),
),
),
new IconButton(
icon: Icon(Icons.remove_circle),
onPressed: () {},
),
],
mainAxisAlignment: MainAxisAlignment.spaceBetween,
)
,
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