Error is Attribute name "multiple" associated with an element type "input" must be followed by the '=' character.
<form class="form-horizontal" action="/addPackage" method="POST" enctype="myltipart/form-data">
<div class="horizontal-divider m-0 m-b-15"></div>
<div class="text-center">
<input type="file" id="picture" name="picture" multiple>
</div>
</form>