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Editorial Team
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Asked: 2026-06-16T11:12:50+00:00

I encounter an error: scala-block-indentation: Wrong type argument: number-or-marker-p, nil Whenever I click tab

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I encounter an error:

scala-block-indentation: Wrong type argument: number-or-marker-p, nil

Whenever I click tab for indent in scala-mode.

I don’t know where goes wrong in the code but want to fix it. However, I can only see this error in *Message* buffer without details. I tried to see this error in Backtrace but didn’t know how. I tried (1) -debug-init to launch emacs (2) debug-on-entry command for scala-block-indentation but neither of them works.

Does anyone have ideas about how to enable BackTrace/Debugger for this function?

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1 Answer

  1. Editorial Team

    I have not used scala under emacs to tell if this can help you. But try (setq debug-on-error t) in your .emacs, or simply do M-: (setq debug-on-error t) to try for the current emacs session only.

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