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If you need to customize the error message in Telerik Report HTML5 Viewer, you are required to do the following tweaking to make it work. The best recommended way is hide/toggle the message and handle your own error message display according to the situation. This is related to the reason we want to hide the error message required when parameters are not fulfilled.

There are many ways we can customise the Telerik Report Parameter in HTML5 mode. Sample of customizing a dropdown list from the parameters