! LaTeX Error: Font family `JY2+mc' unknown.

====
$ cd ~/tmp
$ cat sample-ja.tex
\documentclass[uplatex]{jsarticle}
\begin{document}

まだあげ初めし前髮の
林檎のもとに見えしとき
前にさしたる花櫛の
花ある君と思ひけり

\end{document}
$ platex sample-ja
===

としたら、

===
! LaTeX Error: Font family `JY2+mc' unknown.
===

などとエラーが出た。

===
$ uplatex sample-ja
===

でうまくいった。

エラーの詳細。

===
This is e-pTeX, Version 3.1415926-p3.3-110825-2.4 (utf8.euc) (TeX Live 2012/Debian) (format=platex 2013.12.26) 30 DEC 2013 02:24
entering extended mode
restricted \write18 enabled.
%&-line parsing enabled.
**sample-ja.tex
(./sample-ja.tex
pLaTeX2e <2006/11/10> (based on LaTeX2e <2011/06/27> patch level 0)
Babel <v3.8m> and hyphenation patterns for english, dumylang, nohyphenation, et
hiopic, farsi, arabic, pinyin, croatian, bulgarian, ukrainian, russian, slovak,
czech, danish, dutch, usenglishmax, ukenglish, finnish, french, basque, ngerma
n, german, swissgerman, ngerman-x-2012-05-30, german-x-2012-05-30, monogreek, g
reek, ibycus, ancientgreek, hungarian, bengali, tamil, hindi, telugu, gujarati,
sanskrit, malayalam, kannada, assamese, marathi, oriya, panjabi, italian, lati
n, latvian, lithuanian, mongolian, mongolianlmc, nynorsk, bokmal, indonesian, e
speranto, coptic, welsh, irish, interlingua, serbian, serbianc, slovenian, friu
lan, romansh, estonian, romanian, armenian, uppersorbian, turkish, afrikaans, i
celandic, kurmanji, polish, portuguese, galician, catalan, spanish, swedish, th
ai, loaded.
(/usr/share/texlive/texmf-dist/tex/platex/jsclasses/jsarticle.cls
Document Class: jsarticle 2010/03/14 okumura

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.305 ...{mc}{m}{n}{<-> s * [0.924690] upjisr-h}{}

?

! LaTeX Error: Font family `JY2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.306 ...{gt}{m}{n}{<-> s * [0.924690] upjisg-h}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.307 ...{mc}{m}{n}{<-> s * [0.924690] upjisr-v}{}

?

! LaTeX Error: Font family `JT2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.308 ...{gt}{m}{n}{<-> s * [0.924690] upjisg-v}{}

?

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.318 ...pe{\jsc@JYn}{mc}{m}{it}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.319 ...pe{\jsc@JYn}{mc}{m}{sl}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.320 ...pe{\jsc@JYn}{mc}{m}{sc}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JY2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.321 ...pe{\jsc@JYn}{gt}{m}{it}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JY2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.322 ...pe{\jsc@JYn}{gt}{m}{sl}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.323 ...e{\jsc@JYn}{mc}{bx}{it}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JY2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.324 ...e{\jsc@JYn}{mc}{bx}{sl}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.325 ...pe{\jsc@JTn}{mc}{m}{it}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.326 ...pe{\jsc@JTn}{mc}{m}{sl}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.327 ...pe{\jsc@JTn}{mc}{m}{sc}{<->ssub*mc/m/n}{}

?

! LaTeX Error: Font family `JT2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.328 ...pe{\jsc@JTn}{gt}{m}{it}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JT2+gt' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.329 ...pe{\jsc@JTn}{gt}{m}{sl}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.330 ...e{\jsc@JTn}{mc}{bx}{it}{<->ssub*gt/m/n}{}

?

! LaTeX Error: Font family `JT2+mc' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.331 ...e{\jsc@JTn}{mc}{bx}{sl}{<->ssub*gt/m/n}{}

?
LaTeX Info: Redefining \rmfamily on input line 332.
LaTeX Info: Redefining \sffamily on input line 335.
LaTeX Info: Redefining \ttfamily on input line 338.

! LaTeX Error: Encoding scheme `JY2' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.401 ...areSymbolFont{mincho}{\jsc@JYn}{mc}{m}{n}

?

! LaTeX Error: Unknown symbol font `mincho'.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.402 ...eclareSymbolFontAlphabet{\mathmc}{mincho}

?

! LaTeX Error: Encoding scheme `JY2' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.403 ...bolFont{mincho}{bold}{\jsc@JYn}{gt}{m}{n}

?
! Missing number, treated as zero.
<to be read again>
\symmincho
l.404 \jfam\symmincho

?

! LaTeX Error: Encoding scheme `JY2' unknown.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...

l.405 ...MathAlphabet{\mathgt}{\jsc@JYn}{gt}{m}{n}

?
\fullwidth=\dimen118
\c@part=\count81
\c@section=\count82
\c@subsection=\count83
\c@subsubsection=\count84
\c@paragraph=\count85
\c@subparagraph=\count86
\@abstractbox=\box41
\c@figure=\count87
\c@table=\count88
\abovecaptionskip=\skip41
\belowcaptionskip=\skip42
\@lnumwidth=\dimen119
\bibindent=\dimen120
LaTeX Info: Redefining \TeX on input line 1693.
LaTeX Info: Redefining \LaTeX on input line 1719.
LaTeX Info: Redefining \LaTeXe on input line 1744.
\heisei=\count89
) (./sample-ja.aux)
\openout1 = `sample-ja.aux'.

LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for JY1/mc/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
LaTeX Font Info: Checking defaults for JT1/mc/m/n on input line 2.
LaTeX Font Info: ... okay on input line 2.
[1

] (./sample-ja.aux) )
Here is how much of TeX's memory you used:
359 strings out of 494061
3486 string characters out of 3158057
54837 words of memory out of 3000000
3868 multiletter control sequences out of 15000+200000
8282 words of font info for 34 fonts, out of 3000000 for 9000
750 hyphenation exceptions out of 8191
22i,4n,19p,133b,163s stack positions out of 5000i,500n,10000p,200000b,50000s

Output written on sample-ja.dvi (1 page, 372 bytes).
===

cake clothoid