<p dir="auto">when I've install the phpexcel and update the composer this error is occurred, I tried to clear the cache but the error appeared again.</p>
<p dir="auto">After updating from 2.8.9 to 2.8.10 I experience the following exception for any request. Downgrading again resolves the issue. No other composer dependencies were updated in the process.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="RuntimeException in appDevDebugProjectContainer.php line 7425:
You have requested a synthetic service (&quot;request&quot;). The DIC does not know how to construct this service.
in appDevDebugProjectContainer.php line 7425
at appDevDebugProjectContainer-&gt;getRequestService() in bootstrap.php.cache line 2221
at Container-&gt;get('request', '2') in appDevDebugProjectContainer.php line 10835
at appDevDebugProjectContainer-&gt;synchronizeRequestService() in bootstrap.php.cache line 2157
at Container-&gt;set('request', null, 'request') in bootstrap.php.cache line 3360
at ContainerAwareHttpKernel-&gt;handle(object(Request), '1', true) in bootstrap.php.cache line 2535
at Kernel-&gt;handle(object(Request)) in app_dev.php line 28"><pre class="notranslate"><code class="notranslate">RuntimeException in appDevDebugProjectContainer.php line 7425:
You have requested a synthetic service ("request"). The DIC does not know how to construct this service.
in appDevDebugProjectContainer.php line 7425
at appDevDebugProjectContainer-&gt;getRequestService() in bootstrap.php.cache line 2221
at Container-&gt;get('request', '2') in appDevDebugProjectContainer.php line 10835
at appDevDebugProjectContainer-&gt;synchronizeRequestService() in bootstrap.php.cache line 2157
at Container-&gt;set('request', null, 'request') in bootstrap.php.cache line 3360
at ContainerAwareHttpKernel-&gt;handle(object(Request), '1', true) in bootstrap.php.cache line 2535
at Kernel-&gt;handle(object(Request)) in app_dev.php line 28
</code></pre></div>
<p dir="auto">This might be related to <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="174777746" data-permission-text="Title is private" data-url="https://github.com/symfony/symfony/issues/19825" data-hovercard-type="issue" data-hovercard-url="/symfony/symfony/issues/19825/hovercard" href="https://github.com/symfony/symfony/issues/19825">#19825</a> and also feels like a BC break.</p>