I met these latex format problem, anyone can offer some help?

the .tex file:

usepackage{booktabs}
usepackage{longtable}
usepackage[bf,singlelinecheck=off]{caption}
usepackage{graphicx}

setmainfont[UprightFeatures={SmallCapsFont=AlegreyaSC-Regular}]{Alegreya}

usepackage{framed,color}
definecolor{shadecolor}{RGB}{248,248,248}

renewcommand{textfraction}{0.05}
renewcommand{topfraction}{0.8}
renewcommand{bottomfraction}{0.8}
renewcommand{floatpagefraction}{0.75}

renewenvironment{quote}{begin{VF}}{end{VF}}
letoldhrefhref
renewcommand{href}[2]{#2footnote{url{#1}}}

ifxetex
  usepackage{letltxmacro}
  setlength{XeTeXLinkMargin}{1pt}
  LetLtxMacroSavedIncludeGraphicsincludegraphics
  defincludegraphics#1#{% #1 catches optional stuff (star/opt. arg.)
    IncludeGraphicsAux{#1}%
  }%
  newcommand*{IncludeGraphicsAux}[2]{%
    XeTeXLinkBox{%
      SavedIncludeGraphics#1{#2}%
    }%
  }%
fi

makeatletter
newenvironment{kframe}{%
medskip{}
setlength{fboxsep}{.8em}
 defat@end@of@kframe{}%
 ifinnerifhmode%
  defat@end@of@kframe{end{minipage}}%
  begin{minipage}{columnwidth}%
 fifi%
 defFrameCommand##1{hskip@totalleftmargin hskip-fboxsep
 colorbox{shadecolor}{##1}hskip-fboxsep
     % There is no \@totalrightmargin, so:
     hskip-linewidth hskip-@totalleftmargin hskipcolumnwidth}%
 MakeFramed {advancehsize-width
   @totalleftmarginz@ linewidthhsize
   @setminipage}}%
 {parunskipendMakeFramed%
 at@end@of@kframe}
makeatother

makeatletter
@ifundefined{Shaded}{
}{renewenvironment{Shaded}{begin{kframe}}{end{kframe}}}
makeatother

newenvironment{rmdblock}[1]
  {
  begin{itemize}
  renewcommand{labelitemi}{
    raisebox{-.7height}[0pt][0pt]{
      {setkeys{Gin}{width=3em,keepaspectratio}includegraphics{images/#1}}
    }
  }
  setlength{fboxsep}{1em}
  begin{kframe}
  item
  }
  {
  end{kframe}
  end{itemize}
  }
newenvironment{rmdnote}
  {begin{rmdblock}{note}}
  {end{rmdblock}}
newenvironment{rmdcaution}
  {begin{rmdblock}{caution}}
  {end{rmdblock}}
newenvironment{rmdimportant}
  {begin{rmdblock}{important}}
  {end{rmdblock}}
newenvironment{rmdtip}
  {begin{rmdblock}{tip}}
  {end{rmdblock}}
newenvironment{rmdwarning}
  {begin{rmdblock}{warning}}
  {end{rmdblock}}

usepackage{makeidx}
makeindex

urlstyle{tt}

usepackage{amsthm}
makeatletter
defthm@space@setup{%
  thm@preskip=8pt plus 2pt minus 4pt
  thm@postskip=thm@preskip
}
makeatother

frontmatter

and the error message:

! Extra }, or forgotten endgroup.
endMakeFramed ...eight z@ penalty -100 egroup 
                                                  begingroup fb@put@frame ...
l.907   end{rmdtip}

I feel that the error is in rmdtip, although I tried everything possible, I can not generate the pdf file. I have already updated TinyTex, but nothing.

Anyone can offer help?

Really appreciate all the comments!