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我得到每一页上这个错误，用螺栓CMS：博尔特CMS未知的高速缓存错误
Error: Uncaught exception 'Symfony\Component\HttpKernel\Exception\HttpException' with message
'Error opening file Could not lock app/cache/config_cache.php for writing!
Try logging in with your ftp-client and check to see if it is chmodded to be readable by the webuser (ie: 777 or 766, depending on the setup of your server).
Current path: /chroot/home/alumctr/[intentionally hidden]/html.' in vendor/silex/silex/src/Silex/Application.php:378
Stack trace:
#0 src/Library.php(319): Silex\Application->abort(401, 'Error opening f...')
#1 src/Config.php(753): Bolt\Library::saveSerialize('/chroot/home/al...', Array)
#2 src/Config.php(44): Bolt\Config->saveCache()
#3 src
File: vendor/silex/silex/src/Silex/Application.php
Line: 378
的缓存文件夹为空并且具有777权限。
这个错误从哪里来的？
谢谢大家