Nette and flash messages - php

I have VPS where I run php (7.4) and nginx.
I have installed Nette and other packages by composer.
My problem is:
I can't print flash messages. In my presenter I have code $this->flashMessage("Odhlášení proběhlo úspěšně.", "success");
And in #layout.latte I have this:
{snippet flashes}
{foreach $flashes as $flash}
{if $flash->type === 'success'}
<script>toastr.success({$flash->message});</script>
{elseif $flash->type === 'info'}
<script>toastr.info({$flash->message});</script>
{elseif $flash->type === 'warning'}
<script>toastr.warning({$flash->message});</script>
{elseif $flash->type === 'error'}
<script>toastr.error({$flash->message});</script>
{else}
<script>toastr.info({$flash->message});</script>
{/if}
{/foreach}
{/snippet}
When I dump $flashes in latte nothing is there.
EDIT:
Flashes save to session but latte can't take it from session.
EDIT 2:
I setting flash message by this way:
In processing form:
$this->flashMessage("Obrázek úspěšně upraven.", "success");
$this->redirect("Gallery:default");
What I have to do to fix this?
Thanks for answers.


I have this in #layout.latte and it works. Show the code of presenter where the flashMassage() is.
{snippet flashes}
<div n:foreach="$flashes as $flash" class="flash {$flash->type}">
{$flash->message}
</div>
{/snippet}

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