Uncaught TypeError: c is not a constructor, issue only when creating bar graph - extjs

Question

I have data I have tried to put into a simple bar graph from a local store variable I created. The data goes fine into a traditional table, but get this strange error when trying to create a graph... If i comment out the "axes" the code compiles.. if i leave it in i get this message enter image description here
Code for graph is below... the code base is large so just sending this small snipit
success: function(response){
var obj = Ext.decode(response.responseText);
console.log(obj);
var storeCost = new Ext.data.SimpleStore({
fields:[
{name: 'nameStart',type: 'string'},
{name: 'nameEnd',type: 'string'},
{name: 'nameUnit',type: 'string'},
{name: 'value',type: 'int'}
]
});
console.log('store created');
var costList =[];
for (let i = 0; i < obj.ResultsByTime.length; i++) {
costList.push({nameStart:obj.ResultsByTime[i].TimePeriod.Start, nameEnd:obj.ResultsByTime[i].TimePeriod.End ,nameUnit:obj.ResultsByTime[i].Total.BlendedCost.Unit ,value:Math.round(obj.ResultsByTime[i].Total.BlendedCost.Amount)})
}
storeCost.loadData(costList);
Ext.create('Ext.window.Window', {
layout:'fit',
height: 250,
width: 500,
items:{
xtype: 'cartesian',
renderTo: document.body,
width: 600,
height: 400,
store: {
fields: ['name', 'value'],
data: [{
name: 'metric one',
value: 10
}, {
name: 'metric two',
value: 7
}, {
name: 'metric three',
value: 5
}, {
name: 'metric four',
value: 2
}, {
name: 'metric five',
value: 27
}]
}, axes: [{
type: 'numeric',
position: 'left',
title: {
text: 'Sample Values',
fontSize: 15
},
fields: 'value'
}, {
type: 'category',
position: 'bottom',
title: {
text: 'Sample Values',
fontSize: 15
},
fields: 'name'
}],
series: {
type: 'bar',
subStyle: {
fill: ['#388FAD'],
stroke: '#1F6D91'
},
xField: 'name',
yField: 'value'
}
}

Answer 1

"c is not a constructor" errors tend to be due to a class missing in the requires array.
Since you narrowed it down to the "axes" section, I would assume these entries need to be added to the requires array in your class:
requires: [
'Ext.chart.axis.Numeric',
'Ext.chart.axis.Category'
]