title: How can I get back access to the backend of TYPO3 when fluidpages are causing an error on backend and frontend?
body: <p>I got to work on a Typo3 page and I have to say I'm at the very beginning if it comes to TYPO3.</p>
  
  <p>So I wanted to fix a bug and updated the plugin "fluidpages" from version 4.1.0 (I guess) to 4.3. That cause the "Oops, an error occurred!" in the backend and frontend, so I dont have access from that side. I still have the FTP login for the website. The version of TYPO3 is 8.7.18.</p>
  
  <p>The errorcode I get is that one: </p>
  
  <blockquote>
    <p>Could not analyse class:<br>
    "FluidTYPO3\Flux\Configuration\ConfigurationManager" maybe not loaded
    or no autoloader?<br>
    Class FluidTYPO3\Flux\Configuration\ConfigurationManager does not exist</p>
  </blockquote>
  
  <p>So does anyone know what I need to do?<br>
  From my research I think I need to update another plugins to make it back to work? And can I update them just by uploading them through FTP?</p>
  
  <p>Thanks in advance!</p>
  
  <p>Edit: After I tried to get the old version of the plugin running, I'm getting this error code from the log file:</p>
  
  <blockquote>
    <p>Mon, 17 Feb 2020 22:59:56 +0100 [ALERT] request="fec23f8baf6dc" component="TYPO3.CMS.Frontend.ContentObject.Exception.ProductionExceptionHandler": Oops, an error occurred! Code: 2020021722595594039a4d - {"exception":"TYPO3\CMS\Extbase\Mvc\Exception: The default controller for extension \"Flux\" and plugin \"Page\" can not be determined. Please check for TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin() in your ext_localconf.php.</p>
  </blockquote>