You are facing this minor error because you have not enabled the Leads module in your CRM. The Leads module is disabled by default; you must enable it manually.
Follow these steps to enable the Leads module:
- Log in to your account.
- Click the User Menu icon.
- Click the Settings button.
- Look for the Module Management section.
- Select Modules.
- Search for Leads module.
- Enable the checkbox.
- Go back to the Settings Homepage.
- Refresh the page.
You will now see the Lead Conversion Data Mapping settings under Marketing & Sales section.
To know more about Lead Conversion Data Mapping, click here