ArgumentException error is thrown on creating Sprite Asset in Sprite Importer window.

Steps to repro:
1. Open the attached project.
2. Windows > TextMeshPro > Sprite Importer.
3. Select Sprite Data Source >> EmojiOne Attribution.
4. Sprite Texture Atlas >> EmojiOne.
5. Click on Create Sprite Asset.

Actual Result:
ArgumentException error is thrown in the console.

Expected Result:
No error in the console.

Reproducible in:
2020.1.0a5, 2019.3.0b5, 2019.3.0a1, 2019.2.0f1.

NOTE: Please find attached Stacktrace.

Environment:
Windows & Mac.