public problem with Dropdown object

i added Dropdown object , and serializer.NODE for it.
When i run preview/preview canvas it's ok. But i public project , it's not regconize Dropdown object :( , and throw mess undefine for this.
Please help for solution !
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Do not delete any child nodes of Dropdown.
If still doesn't work, please provide the detailed error message to help us to solve this problem.

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