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I did not understand what error you are talking about, but it is forbidden to delete all of the content and replace it with another. The article from the first put in the right place.

Hello Sir @kouba01,
I posted in Blog section rather than posting in SteemitCryptoAcademy.

Please check for this assignment
https://steemit.com/hive-108451/@mystry360/2osuhb-homeworkpost-steemitcryptoacademy-s4w5-justswap-dex-on-tron-kouba01