When running validation, server returns error Since your browser does not support JavaScript, you must press the Continue button once to proceed. The scenaro was normally recorded using Firefox without any problem.
This message is not really an issue. When you replay your script NeoLoad renders your HTML page but since the internal browser does not support Javascript you get that message.
You can simply ignore such messages. The most important is to check if the content of the server responses are the same between recording and replaying. You can use the difference calculation column to help you identifying the big differences on responses.
And if your script should create something in your application( like ticket id, successful message etc...) you can configure some validations on some server responses to make sure that the replaying is working.