Class 'FluidTYPO3\Flux\Utility\CompatibilityRegistry' not found

$ ./typo3cms 

                                                                   
  [ Error ]                                                        
  Class 'FluidTYPO3\Flux\Utility\CompatibilityRegistry' not found  
                                                                   

Exception trace:
#0 ()
   typo3temp/var/Cache/Code/cache_core/ext_localconf_d9dc50ee3dc618f0c517c78ee27344ba94480edf.php:1393
#1 require_once()
   typo3/sysext/core/Classes/Cache/Backend/SimpleFileBackend.php:361
#2 TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend::requireOnce()
   typo3/sysext/core/Classes/Cache/Frontend/PhpFrontend.php:76
#3 TYPO3\CMS\Core\Cache\Frontend\PhpFrontend::requireOnce()
   typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php:1596
#4 TYPO3\CMS\Core\Utility\ExtensionManagementUtility::loadExtLocalconf()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Scripts.php:169
#5 Helhum\Typo3Console\Core\Booting\Scripts::initializeExtensionConfiguration()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Step.php:53
#6 Helhum\Typo3Console\Core\Booting\Step::__invoke()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Sequence.php:109
#7 Helhum\Typo3Console\Core\Booting\Sequence::invokeStep()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Sequence.php:93
#8 Helhum\Typo3Console\Core\Booting\Sequence::invoke()
   typo3conf/ext/typo3_console/Classes/Core/Booting/RunLevel.php:90
#9 Helhum\Typo3Console\Core\Booting\RunLevel::runSequenceForCommand()
   typo3conf/ext/typo3_console/Classes/Core/Kernel.php:168
#10 Helhum\Typo3Console\Core\Kernel::handle()
   typo3conf/ext/typo3_console/Scripts/typo3-console.php:24
#11 {closure}()
   typo3conf/ext/typo3_console/Scripts/typo3-console.php:26
#12 require()
   typo3cms:19




$ rm -rf typo3temp/*
$ ./typo3cms 

                                                                   
  [ Error ]                                                        
  Class 'FluidTYPO3\Flux\Utility\CompatibilityRegistry' not found  
                                                                   

Exception trace:
#0 ()
   typo3conf/ext/flux/ext_localconf.php:32
#1 require()
   typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php:1621
#2 TYPO3\CMS\Core\Utility\ExtensionManagementUtility::loadSingleExtLocalconfFiles()
   typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php:1598
#3 TYPO3\CMS\Core\Utility\ExtensionManagementUtility::loadExtLocalconf()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Scripts.php:169
#4 Helhum\Typo3Console\Core\Booting\Scripts::initializeExtensionConfiguration()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Step.php:53
#5 Helhum\Typo3Console\Core\Booting\Step::__invoke()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Sequence.php:109
#6 Helhum\Typo3Console\Core\Booting\Sequence::invokeStep()
   typo3conf/ext/typo3_console/Classes/Core/Booting/Sequence.php:93
#7 Helhum\Typo3Console\Core\Booting\Sequence::invoke()
   typo3conf/ext/typo3_console/Classes/Core/Booting/RunLevel.php:90
#8 Helhum\Typo3Console\Core\Booting\RunLevel::runSequenceForCommand()
   typo3conf/ext/typo3_console/Classes/Core/Kernel.php:168
#9 Helhum\Typo3Console\Core\Kernel::handle()
   typo3conf/ext/typo3_console/Scripts/typo3-console.php:24
#10 {closure}()
   typo3conf/ext/typo3_console/Scripts/typo3-console.php:26
#11 require()
   typo3cms:19