You can solve it temporarily by editing the file easymedia/lib/form/AbstractAlbumItemFormBuilderForm.class.php and replacing the following
PHP: AbstractAlbumItemFormBuilderForm.class.php
$labelFormFields[] = LabelFormField::create('lableIDs' . $groupID)
->objectProperty('lableIDs')
->objectType('com.cls.easymedia.image')
->required($labelGroup->forceSelection)
->addDependency(ValueFormFieldDependency::create('category')
->fieldId('categoryIDs')
->values($categoryIDs))
->labelGroup($labelGroup);
with
PHP: AbstractAlbumItemFormBuilderForm.class.php
$labelFormFields[] = LabelFormField::create('lableIDs' . $groupID)
->objectProperty('lableIDs')
->objectType('com.cls.easymedia.video')
->required($labelGroup->forceSelection)
->addDependency(ValueFormFieldDependency::create('category')
->fieldId('categoryIDs')
->values($categoryIDs))
->labelGroup($labelGroup);
This problem will be resolved with the next update.