Internal Server Error after web login (Nextcloud 12.0.3.3)

Hi all,
I don’t understand why 'cause I think I don’t changed anything, but I can’t access my nextcloud server via web login (the username request page appears, then I got the error), it always says “Internal Server Error - The server encountered an internal error and was unable to complete your request. Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report. More details can be found in the server log.”.

My clients are working 100% as usual without any problem, but I can’t access via web.

My log is here. Can anybody take a look? Thanks in advance.

{“reqId”:“CZWZTgcceHBEzkosVIRN”,“level”:3,“time”:“2017-11-04T01:01:32+00:00”,“remoteAddr”:“192.168.1.178”,“user”:“Didi”,“app”:“index”,“method”:“GET”,“url”:"/nextcloud/index.php/apps/files/",“message”:“Exception: {“Exception”:“OCP\\Files\\NotPermittedException”,“Message”:”",“Code”:0,“Trace”:"#0 \/var\/www\/nextcloud\/lib\/private\/Files\/SimpleFS\/SimpleFile.php(104): OC\\Files\\Node\\File->delete()\n#1 \/var\/www\/nextcloud\/lib\/private\/Template\/SCSSCacher.php(252): OC\\Files\\SimpleFS\\SimpleFile->delete()\n#2 \/var\/www\/nextcloud\/lib\/private\/Template\/SCSSCacher.php(164): OC\\Template\\SCSSCacher->resetCache()\n#3 \/var\/www\/nextcloud\/lib\/private\/Template\/SCSSCacher.php(109): OC\\Template\\SCSSCacher->variablesChanged()\n#4 \/var\/www\/nextcloud\/lib\/private\/Template\/CSSResourceLocator.php(99): OC\\Template\\SCSSCacher->process(’\/var\/www\/nextcl…’, ‘core\/css\/server…’, ‘core’)\n#5 \/var\/www\/nextcloud\/lib\/private\/Template\/CSSResourceLocator.php(56): OC\\Template\\CSSResourceLocator->cacheAndAppendScssIfExist(’\/var\/www\/nextcl…’, ‘core\/css\/server…’)\n#6 \/var\/www\/nextcloud\/lib\/private\/Template\/ResourceLocator.php(75): OC\\Template\\CSSResourceLocator->doFind(‘css\/server’)\n#7 \/var\/www\/nextcloud\/lib\/private\/TemplateLayout.php(225): OC\\Template\\ResourceLocator->find(Array)\n#8 \/var\/www\/nextcloud\/lib\/private\/TemplateLayout.php(170): OC\\TemplateLayout::findStylesheetFiles(Array)\n#9 \/var\/www\/nextcloud\/lib\/private\/legacy\/template.php(205): OC\\TemplateLayout->__construct(‘user’, ‘files’)\n#10 \/var\/www\/nextcloud\/lib\/public\/AppFramework\/Http\/TemplateResponse.php(157): OC_Template->fetchPage()\n#11 \/var\/www\/nextcloud\/lib\/private\/AppFramework\/Http\/Dispatcher.php(113): OCP\\AppFramework\\Http\\TemplateResponse->render()\n#12 \/var\/www\/nextcloud\/lib\/private\/AppFramework\/App.php(114): OC\\AppFramework\\Http\\Dispatcher->dispatch(Object(OCA\\Files\\Controller\\ViewController), ‘index’)\n#13 \/var\/www\/nextcloud\/lib\/private\/AppFramework\/Routing\/RouteActionHandler.php(47): OC\\AppFramework\\App::main(‘ViewController’, ‘index’, Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\n#14 [internal function]: OC\\AppFramework\\Routing\\RouteActionHandler->__invoke(Array)\n#15 \/var\/www\/nextcloud\/lib\/private\/Route\/Router.php(299): call_user_func(Object(OC\\AppFramework\\Routing\\RouteActionHandler), Array)\n#16 \/var\/www\/nextcloud\/lib\/base.php(1004): OC\\Route\\Router->match(’\/apps\/files\/’)\n#17 \/var\/www\/nextcloud\/index.php(48): OC::handleRequest()\n#18 {main}",“File”:"\/var\/www\/nextcloud\/lib\/private\/Files\/Node\/File.php",“Line”:122}",“userAgent”:“Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36”,“version”:“12.0.3.3”}