This error suddenly appeared in my file! It was not before what should I do?
File `calc.sty' not found. \RequirePackage
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I'm not expert but I try this and worked.
Copy all in this link: https://web.mit.edu/ghudson/dev/nokrb/third/tetex/texmf/tex/latex/tools/calc.sty
Paste in a note block and save as calc.sty where is save your .tex file