TYPO3 Exception 1440754980¶

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The option "source" is required and must not be empty¶

This happens in 9LTS if you use ExtensionManagementUtility::addModule() with 7LTS parameters. Instead of

'labels' => [
  'tabs_images' => [
    'tab' => 'EXT:someext/Resources/Public/Images/icon.svg',
  ],
  'll_ref' => 'LLL:EXT: someext/Resources/Private/Language/locallang_mod.xml',
]

you need the 8LTS+ parameter type

'icon' => 'EXT: someext/Resources/Public/Icons/icon.svg',
'labels' => 'LLL:EXT: someext/Resources/Private/Language/locallang_mod.xml'