Fix error message

[HoshinoKoji]

Description

Fix a typo in error message which could be misleading.

How Has This Been Tested

Tests are not needed since it changes only the error message.

Types of changes

Documentation

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (non-breaking change which updates documentation)
• Breaking change (fix or feature that would cause existing functionality to change)
• Code style (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Other (please describe here):

Checklist

• [ x ] Code follows the code style of this project.
• [ x ] Changes follow the CONTRIBUTING guidelines.
• [ x ] Update necessary documentation accordingly.
• [ x ] Lint and tests pass locally with the changes.
• [ x ] Check issues and pull requests first. You don't want to duplicate effort.

Other information

[chaoming0625]

Thanks for the contribution!