typo3 how to add a second backend Module - typo3

Question

in my typo3 extension I want to add a second backend modul in navigation.
in ext_tables.php I have this:
if (TYPO3_MODE === 'BE') {
/**
* Creates a Backend Module Category
*/
$modulName = 'InstitutsShop';
//Legt die Position des Moduls fest, hier nach Modul "web"
if (!isset($TBE_MODULES[$modulName])) {
$temp_TBE_MODULES = array();
foreach ($TBE_MODULES as $key => $val) {
if ($key == 'web') {
$temp_TBE_MODULES[$key] = $val;
$temp_TBE_MODULES[$modulName] = '';
} else {
$temp_TBE_MODULES[$key] = $val;
}
}
$TBE_MODULES = $temp_TBE_MODULES;
}
// Hauptmodul erstellen
t3lib_extMgm::addModule($modulName, '', '', t3lib_extMgm::extPath($_EXTKEY) . 'Configuration/BackendModule/');
/**
* Registers a Backend Module
*/
\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
'TYPO3.' . $_EXTKEY, // $extensionName => vendor + extkey, seperated by a dot
'InstitutsShop', // $mainModuleName => Make module a submodule of 'Auditgarant'
'shopbackend', // $subModuleName => module name
'', // $position => position in the group
array( // Allowed controller -> action combinations
'ShopBackend' => 'list, showOrder',
),
array( // $moduleConfiguratione
'access' => 'user,group',
'icon' => 'EXT:' . $_EXTKEY . '/ext_icon_small.svg',
'labels' => 'LLL:EXT:' . $_EXTKEY . '/Resources/Private/Language/locallang_shop_backend.xlf',
)
);
/**
* Registers a Backend Module
*/
\TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
'TYPO3.' . $_EXTKEY, // $extensionName => vendor + extkey, seperated by a dot
'InstitutsShop Produkte', // $mainModuleName => Make module a submodule of 'Auditgarant'
'shopbackendproducts', // $subModuleName => module name
'', // $position => position in the group
array( // Allowed controller -> action combinations
'ShopOrdProduct' => 'list',
),
array( // $moduleConfiguratione
'access' => 'user,group',
'icon' => 'EXT:' . $_EXTKEY . '/ext_icon_small.svg',
'labels' => 'LLL:EXT:' . $_EXTKEY . '/Resources/Private/Language/locallang_shop_backend.xlf',
)
);
}
The first one with controller ShopBackend is displayed ...
The second one not.
What could be the issue in this case?
Thanks in advance.

Answer 1

I'd say that the space is not allowed in the mainModuleName. And I don't think that your extension has the vendor TYPO3.