Hi Seain,
Welcome to the E-Learning Heroes community! I'm sorry to hear that you're running into this issue, but I'm happy to help troubleshoot.
- In what browser is the user receiving this error message? Can they reproduce the issue in a different browser?
- If you're comfortable sharing your file with us here, or privately in a support case, we'll be happy to test it out. We'll delete it from our systems once troubleshooting is complete.
Additionally, if you do not want the user to have to press Enter after entering text, you can try adding some type of trigger to allow Storyline to submit the interaction.