---
title: "Built-in field hasn't been mapped"
canonical: "https://support.appfire.com/space/BGdc/3525345796/Built-in%20field%20hasn't%20been%20mapped"
format: markdown
---
The general field mapping on the host platform (for example, the Jira instance on which you have installed BigGantt) hasn't been done for a particular field.

The mapping of tasks in a particular Box is irrelevant. The check is performed just for the general mapping of the primary instance. 

**Example**

BigGantt is installed on the "nostromo2" Jira instance. The host platform mapping is:

![image2021-6-14_13-17-17.png](media://2ca133de-23a9-416e-96b5-305ae831d403)

The general mapping is on the left:

![image2021-6-14_13-18-17.png](media://b0d17a56-f02f-4c70-8498-f34eba967a63)

To avoid the error when sorting by "End date" or "Start date," the following fields have to be mapped:

![image2021-6-14_13-19-29.png](media://7246b211-9c46-45fb-877a-dad0fc9850f2)

## Built-in fields

The mapping must be done if you want to sort tasks using the built-in field.