html validator Error: The aria-labelledby attribute must point to an element in the same document.
i get the following error for the w3c validator test :
Error: The aria-labelledby attribute must point to an element in the same document.
From line 741, column 7; to line 741, column 108
-->? <ul class="dropdown-menu hidden-md-down languages-block_ul" aria-labelledby="language-selector-label">?
how do solve this problem with a validator?
