Problem with database buckets

before i post i did search the community and this is my first post here i didnt find any answer for my problem.

im trying to make an admin app for posting news and im using firebase this is my block for it,
whenever i press the button it send the data in inserted but without the bucket
these are my blocks

this is my databaseimage_2021-01-13_213219

also it keeps showing me this error all the time

Please, read this greate Guide:

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