title: Why does the WebIDE shows an error for Select elements?
body: <p>I wrote an application in SAPUI5 in WebIDE. When I add Select items to page it shows and error but the program can run without error what is the reason of the error in WebIDE?</p>
  <p>Some part of the code:</p>
  <pre class="lang-xml prettyprint-override"><code>&lt;mvc:View xmlns=&quot;sap.m&quot; xmlns:mvc=&quot;sap.ui.core.mvc&quot; xmlns:semantic=&quot;sap.m.semantic&quot; xmlns:footerbar=&quot;sap.ushell.ui.footerbar&quot; controllerName=&quot;xxx.controller.Worklist&quot;&gt;
      &lt;semantic:FullscreenPage id=&quot;page&quot; navButtonPress=&quot;onNavBack&quot; showNavButton=&quot;true&quot; title=&quot;{i18n&gt;worklistViewTitle}&quot;&gt;
          &lt;semantic:content&gt;
              .....
          &lt;/semantic:content&gt;
          &lt;semantic:customFooterContent&gt;
        // Here it shows error: Semantic Error: SAPUI5: The Association property is incorrect. Please enter the correct value. 
              &lt;ActionSelect xmlns:sap.ui.core=&quot;sap.ui.core&quot; selectedItem=&quot;Element sap.ui.core.ListItem#__item1&quot; selectedKey=&quot;item1&quot; selectedItemId=&quot;__item1&quot; id=&quot;__select_lang&quot;&gt;
                  &lt;items&gt;
                      &lt;sap.ui.core:ListItem text=&quot;English&quot; key=&quot;EN&quot; id=&quot;__item1&quot;/&gt;
                      &lt;sap.ui.core:ListItem text=&quot;German&quot; key=&quot;DE&quot; id=&quot;__item2&quot;/&gt;
                  &lt;/items&gt;
              &lt;/ActionSelect&gt;
          &lt;/semantic:customFooterContent&gt;
      &lt;/semantic:FullscreenPage&gt;
  &lt;/mvc:View&gt;
  </code></pre>
  <p>The error message is:</p>
  <p>error: Semantic Error: SAPUI5: The Association property is incorrect. Please enter the correct value.</p>
  <p>And I tagged in the code where it is shown.</p>