Hi,
Thanks Taha, I solved it in the following way:
I don't really want to add something to my Language enum.
I replaced it with a "dummy" html radio input as you suggested. To make it a
part of the whole radiogroup I had to add the name attribute. Now I also had
to add the value attribute with an empty value, because else I got the same
error as I had initially. And with a condition I preselect the radio input
when needed.
<t:radiogroup t:id="grpLanguage" t:value="selectedLanguage">
<t:loop t:source="languages" t:value="loopLanguage">
<t:radio t:value="language" />
${format:labeled=language.description}
</t:loop>
<t:if t:test="selectedLanguage">
<input type="radio" name="grpLanguage" value="" />
<p:else>
<input type="radio" checked="checked" name="grpLanguage"
value="" />
</p:else>
</t:if>
${message:unknown}
</t:radiogroup>
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