TYPO3 11 Sitepackage Tutorial expected template file Standard/1.html - typo3

Question

TL;DR:
The Backend Layouts of the site package tutorial (Default/Standard and Two Columns) do not show up for new pages in Appearance -> Backend Layout. The error message in this thread (1.html) is an artefact of prior Backend Layouts which came from the original old site setup.
Solution:
To make the Backend Layouts of the site package tutorial show up there, I had to edit the root page of the site: Resources -> Include static Page TSconfig (from extensions) and add site-package from the Available Items list.
This can also be achieved without "Resources -> Include static Page TSconfig (from extensions)" but via file ext_localconf.php in the root of the site package extension (gpcf_theme):
<?php
defined('TYPO3_MODE') || die();
$boot = function (string $_EXTKEY): void {
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('
<INCLUDE_TYPOSCRIPT: source="FILE:EXT:'.$_EXTKEY.'/Configuration/TsConfig/Page/Page.tsconfig">
');
};
$boot('gpcf_theme');
unset($boot);
Original Question:
I'm still trying to bring an existing (older) web page into Typo3 11 following the TYPO3 Sitepackage Tutorial.
Currently I get an
"Oops, an error occurred! Code: 202111161210589c32f8c0"
and can't get rid of it whatever I do.
The corresponding entry in the log files is (line breaks added by me):
../../var/log/typo3_61306f633c.log:Tue, 16 Nov 2021 12:10:58 +0000 [ALERT] request="30cc4e082c853"
component="TYPO3.CMS.Frontend.ContentObject.Exception.ProductionExceptionHandler":
Oops, an error occurred! Code: 202111161210589c32f8c0- InvalidTemplateResourceException:
Tried resolving a template file for controller action "Standard->1" in format ".html",
but none of the paths contained the expected template file (Standard/1.html).
The following paths were checked:
/var/www/html/typo3_11/public/typo3conf/ext/gpcf_theme/Resources/Private/Templates/Page/,
in file /var/www/html/typo3_11/vendor/typo3fluid/fluid/src/View/TemplatePaths.php
I can't find the reason of this error, because I have no idea, where the needed template Standard/1.html is requested from.
Is this some kind of hard coded default if nothing else is found?
If this is the case, the real problem is, that my customizations to the Sitepackage Tutorial source code seems to be wrong, but it never produced any different error despite the above one, which isn't really helpful. Ok, this is speculation, because I don't know.
As you can see, the site package was renamed to gpcf_theme, it's available in the backend and applied as root template to the site. No other template is active (AFAIK). A simple newly created test page creates above error.
If I uncomment in Configuration/TypoScript/Setup/Page.typoscript the lines so that:
page = PAGE
page {
typeNum = 0
10 = TEXT
10.value = Hello World!
}
same error, no hello world.
Any idea how to locate the reason for my misery?

Answer 1

Maybe the fix is really simple. Try to go into the backend:
Edit the homepage
To to the "Appearance" tab
Set the Backend Layout for this and subpages
Save your change
There is a good chance that it is working now.
Whats going on?
You can cast this query on your database:
SELECT
uid, pid, title, backend_layout, backend_layout_next_level
FROM
pages;
Here you get a list of pages, some with backend_layout and backend_layout_next_level filled. Most likely your home pages has some values in this fields?
The value of this field is generated by the TSConfig for backend layouts you set in:
https://docs.typo3.org/m/typo3/tutorial-sitepackage/11.5/en-us/ContentMapping/Index.html#dynamic-content-rendering-in-typoscript
This column is then read and processed in your TypoScript:
https://docs.typo3.org/m/typo3/tutorial-sitepackage/11.5/en-us/TypoScriptConfiguration/Index.html#part-1-fluid-template-section
It is explained below the code snippet.
If the 4 steps from the beginning of my answer did not solve your problem, then this are the places to look.
In TSConfig is the definition of the backend layouts, columns, labels and what is written in the pages.backend_layout db-field
DB columns if the value makes sense pagets__<yourTemplateName>
The TypoScript that reads this db-field cuts of the pagets__ takes the rest, adds .html and searches in the paths defined in the TypoScript below.
check if the Folder and Filename of your Template file are correct.

Answer 2

the error message states that the file 1.html is expected in the folder /var/www/html/typo3_11/public/typo3conf/ext/gpcf_theme/Resources/Private/Templates/Page/
as you noted that you have renamed the site package you may have missed some occurrences of the original package name and so some configuration is missing or pointing to nirvana.