KLatexFormula issue

LaTeX reported an error (exit status 1). Here is full stdout output:
This is pdfTeX, Version 3.141592653-2.6-1.40.26 (MiKTeX 24.4) (preloaded format=latex.fmt)
 restricted \write18 enabled.
entering extended mode
(C:/Users/FoadS/AppData/Local/Temp/klftmp4x1x0-uvWvkr/klftemp.tex
LaTeX2e <2023-11-01> patch level 1
L3 programming layer <2024-03-14>
(C:\Program Files\MiKTeX\tex/latex/base\article.cls
Document Class: article 2023/05/17 v1.4n Standard LaTeX document class
(C:\Program Files\MiKTeX\tex/latex/base\size10.clo))
(C:\Program Files\MiKTeX\tex/latex/graphics\color.sty
(C:\Program Files\MiKTeX\tex/latex/graphics-cfg\color.cfg)
(C:\Program Files\MiKTeX\tex/latex/graphics-def\dvips.def)
(C:\Program Files\MiKTeX\tex/latex/graphics\dvipsnam.def)
(C:\Program Files\MiKTeX\tex/latex/graphics\mathcolor.ltx))
(C:\Program Files\MiKTeX\tex/latex/amsmath\amsmath.sty
For additional information on amsmath, use the `?' option.
(C:\Program Files\MiKTeX\tex/latex/amsmath\amstext.sty
(C:\Program Files\MiKTeX\tex/latex/amsmath\amsgen.sty))
(C:\Program Files\MiKTeX\tex/latex/amsmath\amsbsy.sty)
(C:\Program Files\MiKTeX\tex/latex/amsmath\amsopn.sty))
(C:\Program Files\MiKTeX\tex/latex/amsfonts\amssymb.sty
(C:\Program Files\MiKTeX\tex/latex/amsfonts\amsfonts.sty))
(C:\Program Files\MiKTeX\tex/latex/l3backend\l3backend-dvips.def)
No file klftemp.aux.
(C:\Program Files\MiKTeX\tex/latex/amsfonts\umsa.fd)
(C:\Program Files\MiKTeX\tex/latex/amsfonts\umsb.fd)
! Argument of \align has an extra }.
<inserted text>
                \par
l.16 \end{align} \end{align*}
                             %
? I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{...}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.

? OK, entering \nonstopmode...
Runaway argument?
 \vec {\sigma }x^+
! Paragraph ended before \align was complete.
<to be read again>
                   \par
l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing } inserted.
<inserted text>
                }
l.16 \end{align} \end{align*}
                             %
! Extra }, or forgotten $.
<recently read> }

l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %

! LaTeX Error: \begin{align*} on input line 11 ended by \end{align}.

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

l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Display math should end with $$.
<to be read again>
                   \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing } inserted.
<inserted text>
                }
l.16 \end{align} \end{align*}
                             %
! Misplaced alignment tab character &.
\@tempa ->\endgroup &
                     &
l.16 \end{align} \end{align*}
                             %
! Misplaced alignment tab character &.
\@tempa ->\endgroup &&

l.16 \end{align} \end{align*}
                             %
! Misplaced \omit.
\math@cr@@@ ...@ \@ne \add@amps \maxfields@ \omit
                                                  \kern -\alignsep@ \iftag@ ...
l.16 \end{align} \end{align*}
                             %
! Misplaced \cr.
\math@cr@@@ ...wtrue \fi \global \lineht@ \z@ \cr

l.16 \end{align} \end{align*}
                             %
! Misplaced alignment tab character &.
\@tempa ->\endgroup &
                     &
l.16 \end{align} \end{align*}
                             %
! Misplaced alignment tab character &.
\@tempa ->\endgroup &&

l.16 \end{align} \end{align*}
                             %
! Misplaced \cr.
\measure@ ...olumn@ \z@ \add@amps \maxfields@ \cr
                                                  }}\restorecounters@ \ifodd...
l.16 \end{align} \end{align*}
                             %
! Extra }, or forgotten $.
\measure@ ...lumn@ \z@ \add@amps \maxfields@ \cr }
                                                  }\restorecounters@ \ifodd ...
l.16 \end{align} \end{align*}
                             %
! Extra }, or forgotten $.
\measure@ ...umn@ \z@ \add@amps \maxfields@ \cr }}
                                                  \restorecounters@ \ifodd \...
l.16 \end{align} \end{align*}
                             %
! Missing number, treated as zero.
<to be read again>
                   >
l.16 \end{align} \end{align*}
                             %
! Illegal unit of measure (pt inserted).
<to be read again>
                   >
l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Display math should end with $$.
<to be read again>
                   \endgroup
l.16 \end{align} \end{align*}
                             %

! Package amsmath Error: \begin{align} allowed only in paragraph mode.

See the amsmath package documentation for explanation.
Type  H <return>  for immediate help.
 ...

l.16 \end{align} \end{align*}
                             %
! Argument of \align has an extra }.
<inserted text>
                \par
l.16 \end{align} \end{align*}
                             %
Runaway argument?
 \vec {\sigma }x^+
! Paragraph ended before \align was complete.
<to be read again>
                   \par
l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing \endgroup inserted.
<inserted text>
                \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing } inserted.
<inserted text>
                }
l.16 \end{align} \end{align*}
                             %
! Extra }, or forgotten $.
<recently read> }

l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %

! LaTeX Error: \begin{document} ended by \end{align}.

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

l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Display math should end with $$.
<to be read again>
                   \endgroup
l.16 \end{align} \end{align*}
                             %
! Missing } inserted.
<inserted text>
                }
l.16 \end{align} \end{align*}
                             %
! Extra \endgroup.
<recently read> \endgroup

l.16 \end{align} \end{align*}
                             %
! Misplaced \cr.
\math@cr@@@ ->\cr

l.16 \end{align} \end{align*}
                             %
! Misplaced \noalign.
\math@cr@@ ... \iffalse }\fi \math@cr@@@ \noalign
                                                  {\vskip #1\relax }
l.16 \end{align} \end{align*}
                             %
! Misplaced \noalign.
\black@ #1->\noalign
                     {\ifdim #1>\displaywidth \dimen@ \prevdepth \nointerlin...
l.16 \end{align} \end{align*}
                             %
! Too many }'s.
\endalign ->\math@cr \black@ \totwidth@ \egroup
                                                \ifingather@ \restorealignst...
l.16 \end{align} \end{align*}
                             %

! LaTeX Error: \begin{document} ended by \end{align*}.

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

l.16 \end{align} \end{align*}
                             %
! Missing $ inserted.
<inserted text>
                $
l.16 \end{align} \end{align*}
                             %
! Display math should end with $$.
<to be read again>
                   \endgroup
l.16 \end{align} \end{align*}
                             %
! Extra \endgroup.
<recently read> \endgroup

l.16 \end{align} \end{align*}
                             %
! Too many }'s.
l.17 }

[1] (klftemp.aux) )
(see the transcript file for additional information)
Output written on klftemp.dvi (1 page, 1296 bytes).
Transcript written on klftemp.log.