Compilation error: Missing FQBN (Fully Qualified Board Name)

[rinadoy]

Hello, when I write my code when I scan it or upload it to Arduino Uno I get this message in Arduino IDE 2.1.0
Missing FQBN (Fully Qualified Board Name)

Compilation error: Missing FQBN (Fully Qualified Board Name)
And in Arduino IDE 1.8.19 this message appears: recipe.preproc.macros pattern is missing
What's the solution?

[ptillisch]

Hi @rinadoy. I'm going to ask you to post some additional information that might help us to identify the problem.

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NOTE: These instructions will not solve the problem. They are only intended to gather more information which might provide a clue that eventually leads to a solution.

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Please do this:

1. Select File > Preferences from the Arduino IDE menus.
2. Check the box next to "Show verbose output during: ☐ compilation".
3. Click the OK button.
4. Select Sketch > Verify/Compile from the Arduino IDE menus.
5. Wait for the compilation to fail.
6. You will see a "Compilation error: ..." notification at the bottom right corner of the Arduino IDE window. Click the COPY ERROR MESSAGES button on that notification.
7. Open a forum reply here by clicking the Reply button.
8. Click the <CODE/> icon on the post composer toolbar.
   This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
   
9. Press Ctrl+V.
   This will paste the compilation output into the code block.
10. Move the cursor outside of the code tags before you add any additional text to your reply.
11. Click the Reply button to post the output.

[abade]

hi,
i have a same problem.

FBQN مفقود (Fully Qualified Board Name)

Compilation error: FBQN مفقود (Fully Qualified Board Name)```

[sterretje]

@abade

Did you select a board?
Did it work in the past in IDE 2.x?

Can you post the output that @ptillisch requested in the previous post?