Error messages repeat many times

[phanhuutai]

I have one field (radio type) with options: 1 month, 2 months, 3 months, 4 months
In backend, I set it required
In frontend, if user choose no option and submit, there are 4 error messages "Please select a radio" displayed. They are repeated 4 times. Is there any way to display only one message? It's wasted space if validation display 4 messages: "Please select a radio""Please select a radio""Please select a radio""Please select a radio"

Sorry for my bad english
Thanks for helping.