feat: add error message

[Dun-sin]

👨‍💻 Changes proposed(What did you do ?)

• set error when code inputted is wrong
• move error message p tag to the bottom of the forms

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title and description of the PR is clear and explains the approach.

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