"Font T1/cmr/m/n/12=ecrm1200 at 12.0pt not loadable" error when compiling

Question

I have problem in executing LaTeX files by terminal in Mac due to missing files and unknown modification of TeX directory. As I am new user, I don't want to make too changes in system files and ask someone to help to get rid of the problem. For the tex file "my-slides", I have used latex my-slides, and following errors occur

Shabbirs-MacBook-Pro:slides shabbir$ latex my-slides
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/MacPorts 2018.47642_7) (preloaded format=latex)
 restricted \write18 enabled.
entering extended mode
(./my-slides.tex
LaTeX2e <2018-04-01> patch level 2
Babel <3.18> and hyphenation patterns for 3 language(s) loaded.
(/opt/local/share/texmf-texlive/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/opt/local/share/texmf-texlive/tex/latex/base/size12.clo))
(/opt/local/share/texmf-texlive/tex/latex/graphics/graphicx.sty
(/opt/local/share/texmf-texlive/tex/latex/graphics/keyval.sty)
(/opt/local/share/texmf-texlive/tex/latex/graphics/graphics.sty
(/opt/local/share/texmf-texlive/tex/latex/graphics/trig.sty)
(/opt/local/share/texmf-texlive/tex/latex/graphics-cfg/graphics.cfg)
(/opt/local/share/texmf-texlive/tex/latex/graphics-def/dvips.def)))
(/opt/local/share/texmf-texlive/tex/latex/graphics/color.sty
(/opt/local/share/texmf-texlive/tex/latex/graphics-cfg/color.cfg)
(/opt/local/share/texmf-texlive/tex/latex/graphics/dvipsnam.def))
(/opt/local/share/texmf-texlive/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/opt/local/share/texmf-texlive/tex/latex/amsmath/amstext.sty
(/opt/local/share/texmf-texlive/tex/latex/amsmath/amsgen.sty))
(/opt/local/share/texmf-texlive/tex/latex/amsmath/amsbsy.sty)
(/opt/local/share/texmf-texlive/tex/latex/amsmath/amsopn.sty))
(/opt/local/share/texmf-texlive/tex/latex/amsfonts/amssymb.sty
(/opt/local/share/texmf-texlive/tex/latex/amsfonts/amsfonts.sty))
(/opt/local/share/texmf-texlive/tex/latex/txfonts.sty)
(/opt/local/share/texmf-texlive/tex/latex/base/fontenc.sty
(/opt/local/share/texmf-texlive/tex/latex/base/t1enc.def)
kpathsea: Running mktextfm ecrm1200
/opt/local/share/texmf-texlive/web2c/mktexnam: Could not map source abbreviation  for ecrm1200.
/opt/local/share/texmf-texlive/web2c/mktexnam: Need to update ?
mktextfm: Running mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input ecrm1200
This is METAFONT, Version 2.7182818 (TeX Live 2018/MacPorts 2018.47642_7) (preloaded base=mf)


kpathsea: Running mktexmf ecrm1200
! I can't find file `ecrm1200'.
<*> ...ljfour; mag:=1; nonstopmode; input ecrm1200

Please type another input file name
! Emergency stop.
<*> ...ljfour; mag:=1; nonstopmode; input ecrm1200

Transcript written on mfput.log.
grep: ecrm1200.log: No such file or directory
mktextfm: `mf-nowin -progname=mf \mode:=ljfour; mag:=1; nonstopmode; input ecrm1200' failed to make ecrm1200.tfm.
kpathsea: Appending font creation commands to missfont.log.

! Font T1/cmr/m/n/12=ecrm1200 at 12.0pt not loadable: Metric (TFM) file not fou
nd.
<to be read again> 
                   relax 
l.105 \fontencoding\encodingdefault\selectfont

?  

I have 2015 and 2017 versions of Latex installed and need to compile for dvipdfmx command for my desired pdf output. It seems fonts problem but how to correctly fix it is a problem for me.

Can someone help please?