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I'm using Ubuntu 19.04 and Emacs 26.1. Whenever I try to use inline preview (with any region, section, or environment that has inline math), I get the following error:

...
TeX Output exited as expected with code 1 at Mon May 13 20:01:20
Running `Preview-PDF2DSC' with ``pdf2dsc _region_.pdf _region_.prv/tmpQWkzKT/preview.dsc''

Preview-PDF2DSC killed at Mon May 13 20:01:20
LaTeX: Wrong type argument: number-or-marker-p, nil

and the preview job quits. When I enable debugging, with M-x toggle-debug-on-error, I get the following output:

Debugger entered--Lisp error: (wrong-type-argument number-or-marker-p nil)
  signal(wrong-type-argument (number-or-marker-p nil))
  preview-reraise-error(#<process Preview-LaTeX>)
  preview-TeX-inline-sentinel(#<process Preview-LaTeX> "Preview-LaTeX")
  TeX-command-sentinel(#<process Preview-LaTeX> "exited abnormally with code 1\n")

I've tried the answer posted in this link but my preview-gs-command variable is already set to usr/bin/gs, which I think is sufficient.

Please let me know where I can find a fix to this.

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