scrlayer-scrpage将该包与包landscape中的环境一起使用pdflscape会创建一对overfull \hboxbadbox。
一些用户评论说他们没有收到 badbox。
版本信息：
我正在使用 Tex Live 2014（TeXworks、pdfLaTex）。
*File List*
article.cls 2007/10/19 v1.4h Standard LaTeX document class
size10.clo 2007/10/19 v1.4h Standard LaTeX file (size option)
scrlayer-scrpage.sty 14/12/2013 v0.9.1548 package (end user interface for scrlayer)
scrlayer.sty 31/10/2013 v0.9.1480 package (defining layers and page styles)
scrkbase.sty 2013/12/19 v3.12 KOMA-Script package (KOMA-Script-dependent basics and keyval usage)
scrbase.sty 2013/12/19 v3.12 KOMA-Script package (KOMA-Script-independent basics and keyval usage)
keyval.sty 2014/05/08 v1.15 key=value parser (DPC)
scrlfile.sty 2013/12/19 v3.12 KOMA-Script package (loading files)
pdflscape.sty 2008/08/11 v0.10 Display of landscape pages in PDF (HO)
lscape.sty 2000/10/22 v3.01 Landscape Pages (DPC)
graphics.sty 2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2010/04/23 v1.9 graphics configuration of TeX Live
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
supp-pdf.mkii
pdftexcmds.sty 2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ifluatex.sty 2010/03/01 v1.3 Provides the ifluatex switch (HO)
epstopdf-base.sty 2010/02/09 v2.5 Base part for package epstopdf
grfext.sty 2010/08/19 v1.1 Manage graphics extensions (HO)
kvdefinekeys.sty 2011/04/07 v1.3 Define keys (HO)
kvoptions.sty 2011/06/30 v3.11 Key value format for package options (HO)
kvsetkeys.sty 2012/04/25 v1.16 Key value parser (HO)
etexcmds.sty 2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX Live
平均能量损失
\documentclass{article}
\listfiles
\usepackage{scrlayer-scrpage} % improved header commands. [supercedes `fancyhdr' package].
\usepackage{pdflscape} % landscape page layout.
\begin{document}
\begin{landscape}
a
\end{landscape}
\end{document}
图片
答案1
我使用以下软件包版本编译了您的代码，没有出现错误和警告：
*File List*
article.cls 2014/09/29 v1.4h Standard LaTeX document class
size10.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
scrlayer-scrpage.sty 2015/07/02 v3.18 KOMA-Script package (end user interface for scrlayer)
scrlayer.sty 2015/07/02 v3.18 KOMA-Script package (defining layers and page styles)
scrkbase.sty 2015/07/02 v3.18 KOMA-Script package (KOMA-Script-dependent basics and keyval usage)
scrbase.sty 2015/07/02 v3.18 KOMA-Script package (KOMA-Script-independent basics and keyval usage)
keyval.sty 2014/10/28 v1.15 key=value parser (DPC)
scrlfile.sty 2015/07/02 v3.18 KOMA-Script package (loading files)
pdflscape.sty 2008/08/11 v0.10 Display of landscape pages in PDF (HO)
lscape.sty 2000/10/22 v3.01 Landscape Pages (DPC)
graphics.sty 2014/10/28 v1.0p Standard LaTeX Graphics (DPC,SPQR)
trig.sty 1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg 2007/01/18 v1.5 graphics configuration of teTeX/TeXLive
pdftex.def 2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty 2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty 2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
ifpdf.sty 2011/01/30 v2.3 Provides the ifpdf switch (HO)
ifxetex.sty 2010/09/12 v0.6 Provides ifxetex conditional
supp-pdf.mkii
***********
我希望您能意识到您应该更新您的 tex 发行版。您使用的版本有点过时了！例如，请参阅article.cls和scrlayer-scrpage.sty。
顺便说一句：\listfiles第一行应该更好，所以首先\listfiles，第二行接下来\documentclass ...。