The type Sqits\UserStamps\Concern...ent\Relations\BelongsTo was not found. Did you mean Illuminate\Database\Eloquent\Relations\BelongsTo? If so, make sure to prefix the type with \.
It seems like belongsTo() must be provided by classes using this trait. How about adding it as abstract method to this trait?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation