Hello and thank you for your quick response.
Indeed I went a bit quickly on the copy-paste but the object “L10n.load ()” was well closed in my code.
On the other hand, thanks to your stackblitz, I could see that I was missing 2 packages:
"@syncfusion/ej2-file-utils": "^18.2.44"
"@syncfusion/ej2-react-base": "18.2.44" instead "@syncfusion/ej2-base": "18.2.44"
Problem solved, thanks a lot Praveenkumar!