问题
I'm getting this at the bottom of my page, where the debug bar should be. What is the problem?
This request: http://localhost:81/xxx/web/debug/default/toolbar?tag=5578f180963e82.28312577 is returning 404.
I need to see the error message & stack trace generated when I log to Yii::error(). It's not showing in runtime/log/app.log, so I need the debug bar.
回答1:
I removed files from frontend/runtime/debug and frontend/runtime/cache and nothing was changed.
But when I removed all folders from frontend/runtime then it started to work.
回答2:
One reason could be missing write permissions for the runtime folder. The Debug Tool Bar creates there another directory debug which is used for *.data files.
This happens easily if the web server has its own user which differs to the user that has created the runtime folder.
回答3:
I tried the info above without luck (and I suggest people here do the same, as in most circumstances it will solve your problem). But what worked for me was running.
tail -f frontend/runtime/logs/app.log and it told me that there was an error with a table that it expected to exist but did not. Once I fixed that underlying issue my problem went away.
In my specific case, I had the following enabled but no corresponding table/s.
'authManager' => [
'class' => 'yii\rbac\DbManager',
],
Once I commented/removed it from my config, everything started working.
回答4:
i tried the removal of runtime folders but it didn't change a thing but a composer update fixed it for me
来源：https://stackoverflow.com/questions/30770524/yii2-not-found-404-unable-to-find-debug-data-tagged-with-5578effb0790c4-13