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This one works with caption v3.0j, v3.1m, and v3.2c, and solve the compatibility problems between the JINST document class and the caption package:

Replace \usepackage{subfig} with:

\usepackage[caption=false]{subfig}
% Make \subref robust
\makeatletter
\AtBeginDocument{%
\DeclareRobustCommand ...

The caption package is simply not compatible with your non-standard document class. I suggest to drop it and find another way to customize your captions. Contact the class maintainer and ask for help.


Thanks for the answer, but this is not the reason of the error on the journal computer. Somehow ...

Hi,

I have been trying to prepare a document with an already supplied package (JINST) by a journal. After 2-3 compiles on my computer, everything works fine, except a warning:

Package caption Warning: Unsupported document class (or package) detected, (caption) usage of the caption package is not ...