抛出else if错误

我已经给出了2个选项(上传图标/选择图标)的形式，但当我用php检查它的抛出错误…

<label class="tagslabel">Upload Icon</label>
<input name="uploadicon" type="file" />
<span>or</span>
<ul class="icons clearfix">
    <li>
        <input type="radio" value="123456" name="selecticon"/>
        <label for="selecticon">
            <img src="pics/123456.jpg" alt="123456" width="34" height="34" />
        </label>
    </li>
    <li>
        <input type="radio" value="654321" name="selecticon" />
        <label for="selecticon">
            <img src="pics/654321.jpg" alt="654321" width="34" height="34" />
        </label>
    </li>
</ul>

if (!empty($_FILES['uploadicon']['name'])) {
     //do image processing and validation
}
else {
    if($_POST['selecticon'] == '') $errors['selecticon'] = 'Please Select An Icon or upload Icon!';
}

Notice: Undefined index: selecticon