AUR6001

Error Message

AUR6001: Invalid calculation state. Virtual repeater has no items.

Description

This error occurs when the virtual repeater tries to perform a measurement/render calculation that requires an items collection, but the collection is missing (null/undefined) or empty at a time when the strategy expects at least one item.

Example Trigger

export class MyList {
  // ❌ items is undefined initially
  items: unknown[];
}

<template>
  <div virtual-repeat.for="item of items">${item}</div>
</template>

Correct Usage

• Initialize the collection (items = []) and then replace it when data arrives.

• If the list is conditional, guard it with if.bind until data is ready.

export class MyList {
  // ✅ always an array
  items: unknown[] = [];
}

<template>
  <div if.bind="items.length">
    <div virtual-repeat.for="item of items">${item}</div>
  </div>
</template>

Troubleshooting

• Verify the collection expression resolves to an Array (or a supported collection type for your setup).

• If the collection is async-loaded, ensure it’s initialized before the template is rendered.