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Editorial Team
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Editorial Team
Asked: June 5, 20262026-06-05T08:02:14+00:00 2026-06-05T08:02:14+00:00

I am new to android and just started it. I created a file in

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I am new to android and just started it. I created a file in res folder, menu/mainMenu.xml. But i got the error

Error: res/menu/mainMenu.xml: invalid file name: must contain only[a-z0-9_.]

When i changed the file name to just mainmenu(remove the capital M) then it started working. Why? I am using intelliJ 10.5.1.

Thanks

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  1. Editorial Team
    Editorial Team
    2026-06-05T08:02:15+00:00Added an answer on June 5, 2026 at 8:02 am

    it should be mainmenu.xml ,no capital letter is allowed in naming of xml files.

      File name must contain only lowercase a-z, 0-9, or _.
    
    • only a-z,mind that not capital…and white-space not allowed

    • name must start with a character.not with a Number(0-9)

    • name only _ symbol allowed.no other symbol alowed.

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