Could you inspect your web server logs and Symfony logs, and paste the actual error message please?

Since Symfony 2.4, the profiler persisting the data used by the WDT is the very last thing done by Symfony (after sending emails).
Before #10773 you would just not have see nothing displayed (no WDT either).

The alert you see means that the profiler has not been able to find the token requested in the 2500ms allowed, and emails can take a lot of time to be sent.
However if you click OK in the alert, you should be redirected to the profiler and figure out what precisely is slow.

@revelator123 any news?

Closing as there is no feedback from the reporter. Feel free to reopen with more information.

This same issue is still present on Symfony 3.1

@numediaweb Please open a new issue providing the necessary information to reproduce your issue.

I also have the same issue

@safwan74 Please open a new issue providing the necessary information to reproduce your issue.

Hello xabbuh, I came to realise that it wasn't symfony issue, the problem is fixed by increasing both the max_execution_time and memory_limit in the php.ini file. I no longer see the problem with my current settings. My code had required more memory. I hope this help others.