This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex 2020.6.14)  10 DEC 2020 21:15
entering extended mode
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**beamerfontthemepterosor.sty
(./beamerfontthemepterosor.sty
LaTeX2e <2020-02-02> patch level 5
L3 programming layer <2020-06-03>

LaTeX Warning: You have requested package `',
               but the package provides `beamerfontthemepterosor'.

Package: beamerfontthemepterosor 2020/12/10 pterosor font theme
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Package: etoolbox 2019/09/21 v2.5h e-TeX tools for LaTeX (JAW)
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Package: ifxetex 2019/10/25 v0.7 ifxetex legacy package. Use iftex instead.

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Package: iftex 2020/03/06 v1.0d TeX engine tests
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Package: ifluatex 2019/10/25 v1.5 ifluatex legacy package. Use iftex instead.
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Package beamerthemepterosor Warning: You need to compile with XeLaTeX or LuaLaT
eX to use the Fira fonts on input line 97.

./beamerfontthemepterosor.sty:98: Undefined control sequence.
l.98 \setbeamerfont
                   {title}{size=\Large,%
? 
./beamerfontthemepterosor.sty:98: Emergency stop.
l.98 \setbeamerfont
                   {title}{size=\Large,%
End of file on the terminal!

 
Here is how much of TeX's memory you used:
 855 strings out of 480478
 17943 string characters out of 5899595
 254474 words of memory out of 5000000
 16952 multiletter control sequences out of 15000+600000
 532338 words of font info for 24 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 43i,0n,46p,812b,16s stack positions out of 5000i,500n,10000p,200000b,80000s
./beamerfontthemepterosor.sty:98:  ==> Fatal error occurred, no output PDF file
 produced!