| 1 | <?php  | 
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| 12 | class ImageSliderItem extends BaseSliderItem { | 
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| 13 | |||
| 14 | /**  | 
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| 15 | * @var array  | 
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| 16 | * @config  | 
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| 17 | */  | 
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| 18 | private static $has_one = [  | 
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| 19 | 'Picture' => 'Image',  | 
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| 20 | ];  | 
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| 21 | |||
| 22 | /**  | 
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| 23 | * @return string  | 
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| 24 | */  | 
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| 25 |     public function singular_name() { | 
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| 28 | |||
| 29 | /**  | 
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| 30 | * @return string  | 
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| 31 | */  | 
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| 32 |     public function plural_name() { | 
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| 35 | |||
| 36 | /**  | 
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| 37 | * @return \FieldList  | 
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| 38 | */  | 
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| 39 |     public function getCMSFields() { | 
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| 57 | }  | 
            
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.