In this article you will learn to what to do when you receive an error message that looks like this when adding a roster to your participant list:
![](https://support.learnifier.com/file.php/821MRZAWYYDXT82034433566C/accent.png)
Enter the roster file
Add the symbol ‘ in front of the phone number
![](https://support.learnifier.com/file.php/821DZKBTTJASD820361CF98C1/accent-2.png)
In this article you will learn to what to do when you receive an error message that looks like this when adding a roster to your participant list:
Enter the roster file
Add the symbol ‘ in front of the phone number