title: Symfony 4 - Failed to save key...of type array: touch(): Utime failed: Operation not permitted
body: <p>I find this error on a web page that runs with Symfony 4.3.2</p>
  
  <pre><code>Failed to save key "xxxx" of type array: touch(): Utime failed: Operation not permitted
  </code></pre>
  
  <p>but I have no idea where it comes from, so if someone has a little lead, I'm a buyer.
  I don't know if it can help but I use ubuntu on windows 10</p>
  
  <pre><code>[2019-07-26 16:04:09] php.DEBUG: Warning: chmod(): Operation not permitted {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\SilencedErrorContext: {\"severity\":2,\"file\":\"/devdir/myProject/vendor/symfony/filesystem/Filesystem.php\",\"line\":696,\"trace\":[{\"file\":\"/devdir/myProject/vendor/symfony/config/ResourceCheckerConfigCache.php\",\"line\":124,\"function\":\"dumpFile\",\"class\":\"Symfony\\\\Component\\\\Filesystem\\\\Filesystem\",\"type\":\"-&gt;\"}],\"count\":1})"} []
  [2019-07-26 16:04:09] php.DEBUG: Warning: chmod(): Operation not permitted {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\SilencedErrorContext: {\"severity\":2,\"file\":\"/devdir/myProject/vendor/symfony/filesystem/Filesystem.php\",\"line\":202,\"trace\":[{\"file\":\"/devdir/myProject/vendor/symfony/config/ResourceCheckerConfigCache.php\",\"line\":126,\"function\":\"chmod\",\"class\":\"Symfony\\\\Component\\\\Filesystem\\\\Filesystem\",\"type\":\"-&gt;\"}],\"count\":1})"} []
  [2019-07-26 16:04:09] request.INFO: Matched route "fos_js_routing_js". {"route":"fos_js_routing_js","route_parameters":{"_route":"fos_js_routing_js","_controller":"fos_js_routing.controller::indexAction","_format":"js"},"request_uri":"http://myProject.local/js/routing?callback=fos.Router.setData","method":"GET"} []
  [2019-07-26 16:04:09] cache.WARNING: Failed to save key "%5BFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:09] cache.WARNING: Failed to save key "%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:09] cache.WARNING: Failed to save key "%5BFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:09] cache.WARNING: Failed to save key "%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:20] request.INFO: Matched route "fos_js_routing_js". {"route":"fos_js_routing_js","route_parameters":{"_route":"fos_js_routing_js","_controller":"fos_js_routing.controller::indexAction","_format":"js"},"request_uri":"http://myProject.local/js/routing?callback=fos.Router.setData","method":"GET"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5BFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5BFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DFOS%5CJsRoutingBundle%5CController%5CController%23indexAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] request.INFO: Matched route "_wdt". {"route":"_wdt","route_parameters":{"_route":"_wdt","_controller":"web_profiler.controller.profiler::toolbarAction","token":"a0f28c"},"request_uri":"http://myProject.local/_wdt/a0f28c","method":"GET"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5BSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5B%5BC%5DSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5BSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%23toolbarAction%5D%5B1%5D" of type array: touch(): Utime failed: Operation not permitted {"key":"%5BSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%23toolbarAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  [2019-07-26 16:04:21] cache.WARNING: Failed to save key "%5B%5BC%5DSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%23toolbarAction%5D%5B1%5D" of type integer: touch(): Utime failed: Operation not permitted {"key":"%5B%5BC%5DSymfony%5CBundle%5CWebProfilerBundle%5CController%5CProfilerController%23toolbarAction%5D%5B1%5D","exception":"[object] (ErrorException(code: 0): touch(): Utime failed: Operation not permitted at /devdir/myProject/vendor/symfony/cache/Traits/FilesystemCommonTrait.php:95)"} []
  </code></pre>