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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
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Or for longer, use three backticks above and below the code snippet:
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example
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 20.0.0
Operating system and version (eg, Ubuntu 20.04): Ubuntu Mate 20.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.41
PHP version (eg, 7.1): 7.4.3
The issue you are facing: When I try to go to the login page, I am faced with an internal server error message.
The output of your Nextcloud log in Admin > Logging:
{"reqId":"iOWEtIENKTzidVt94izo","level":3,"time":"2020-10-13T21:41:40+00:00","remoteAddr":"192.168.0.10","user":"--","app":"no app in context","method":"GET","url":"/nextcloud/index.php/js/core/merged-template-prepend.js?v=93573ab1-0","message":{"Exception":"OCP\\AppFramework\\QueryException","Message":"Could not resolve OCA\\Files_Versions\\Versions\\IVersionManager! Class can not be instantiated","Code":0,"Trace":[{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":126,"function":"resolve","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":455,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/DependencyInjection/DIContainer.php","line":427,"function":"queryNoFallback","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":56,"function":"query","class":"OC\\AppFramework\\DependencyInjection\\DIContainer","type":"->"},{"file":"/var/www/nextcloud/apps/files_versions/lib/AppInfo/Application.php","line":119,"function":"get","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/apps/files_versions/lib/AppInfo/Application.php","line":106,"function":"loadBackend","class":"OCA\\Files_Versions\\AppInfo\\Application","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Bootstrap/FunctionInjector.php","line":68,"function":"registerVersionBackends","class":"OCA\\Files_Versions\\AppInfo\\Application","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Bootstrap/BootContext.php","line":52,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\FunctionInjector","type":"->"},{"file":"/var/www/nextcloud/apps/files_versions/lib/AppInfo/Application.php","line":91,"function":"injectFn","class":"OC\\AppFramework\\Bootstrap\\BootContext","type":"->"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php","line":168,"function":"boot","class":"OCA\\Files_Versions\\AppInfo\\Application","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_App.php","line":191,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_App.php","line":131,"function":"loadApp","class":"OC_App","type":"::"},{"file":"/var/www/nextcloud/apps/dav/lib/AppInfo/Application.php","line":113,"function":"loadApps","class":"OC_App","type":"::"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Bootstrap/Coordinator.php","line":168,"function":"boot","class":"OCA\\DAV\\AppInfo\\Application","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_App.php","line":191,"function":"bootApp","class":"OC\\AppFramework\\Bootstrap\\Coordinator","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_App.php","line":131,"function":"loadApp","class":"OC_App","type":"::"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Util.php","line":201,"function":"loadApps","class":"OC_App","type":"::"},{"file":"/var/www/nextcloud/lib/private/Files/Filesystem.php","line":267,"function":"setupFS","class":"OC_Util","type":"::"},{"file":"/var/www/nextcloud/lib/private/Server.php","line":377,"function":"getMountManager","class":"OC\\Files\\Filesystem","type":"::"},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":155,"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/3rdparty/pimple/pimple/src/Pimple/Container.php","line":118,"function":"OC\\AppFramework\\Utility\\{closure}","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","line":122,"function":"offsetGet","class":"Pimple\\Container","type":"->"},{"file":"/var/www/nextcloud/lib/private/ServerContainer.php","line":156,"function":"query","class":"OC\\AppFramework\\Utility\\SimpleContainer","type":"->"},{"file":"/var/www/nextcloud/lib/private/Server.php","line":407,"function":"query","class":"OC\\ServerContainer","type":"->"},{"function":"OC\\{closure}","class":"OC\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/Files/Node/LazyFolder.php","line":63,"function":"call_user_func"},{"file":"/var/www/nextcloud/lib/private/Files/Node/LazyFolder.php","line":143,"function":"__call","class":"OC\\Files\\Node\\LazyFolder","type":"->"},{"file":"/var/www/nextcloud/lib/private/Files/AppData/AppData.php","line":142,"function":"get","class":"OC\\Files\\Node\\LazyFolder","type":"->"},{"file":"/var/www/nextcloud/lib/private/Template/JSCombiner.php","line":97,"function":"getFolder","class":"OC\\Files\\AppData\\AppData","type":"->"},{"file":"/var/www/nextcloud/lib/private/Template/JSResourceLocator.php","line":116,"function":"process","class":"OC\\Template\\JSCombiner","type":"->"},{"file":"/var/www/nextcloud/lib/private/Template/JSResourceLocator.php","line":72,"function":"cacheAndAppendCombineJsonIfExist","class":"OC\\Template\\JSResourceLocator","type":"->"},{"file":"/var/www/nextcloud/lib/private/Template/ResourceLocator.php","line":79,"function":"doFind","class":"OC\\Template\\JSResourceLocator","type":"->"},{"file":"/var/www/nextcloud/lib/private/TemplateLayout.php","line":364,"function":"find","class":"OC\\Template\\ResourceLocator","type":"->"},{"file":"/var/www/nextcloud/lib/private/TemplateLayout.php","line":194,"function":"findJavascriptFiles","class":"OC\\TemplateLayout","type":"::"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Template.php","line":183,"function":"__construct","class":"OC\\TemplateLayout","type":"->"},{"file":"/var/www/nextcloud/lib/private/Template/Base.php","line":132,"function":"fetchPage","class":"OC_Template","type":"->"},{"file":"/var/www/nextcloud/lib/private/legacy/OC_Template.php","line":332,"function":"printPage","class":"OC\\Template\\Base","type":"->"},{"file":"/var/www/nextcloud/index.php","line":63,"function":"printExceptionErrorPage","class":"OC_Template","type":"::"}],"File":"/var/www/nextcloud/lib/private/AppFramework/Utility/SimpleContainer.php","Line":111,"CustomMessage":"Could not boot files_versionsCould not resolve OCA\\Files_Versions\\Versions\\IVersionManager! Class can not be instantiated"},"userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36","version":"20.0.0.9"}