昨天我使用该siunitx软件包做了一些家庭作业，它运行良好。今天，我在处理同一个文档，出于某种我不知道的原因，TeXstudio 开始抛出近 100 个与siunitx和expl3软件包相关的错误。其中一些值得注意的错误是：
! 软件包 siunitx 错误：支持软件包 expl3 太旧。
仅可用于序言。{综合 (SI) 单位包}
我不知道发生了什么。我重新安装了 TeX Live 发行版，但错误仍然存在。我该怎么办？
我使用的是 2020 版的 TeX Live，siunitx软件包的版本是 2.8b。
如果有人能帮助我我会很高兴，因为这个包对我的工作确实很有用。
这是一个 MWE（我认为它不会有帮助，但无论如何）：
\documentclass{article}
\usepackage{siunitx}
\begin{document}
hihi
\end{document}
编辑-1：刚刚注意到一件事。出于某种原因，使用终端而不是 LaTeX 编辑器来编译文件不会出现任何错误。
編輯-2：日志文件（部分）：
! LaTeX Error: Missing \begin{document}.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.77 \ExplLoaderFileDate{expl3.sty}}
%
! Undefined control sequence.
l.82 \bool
_new:N \g__expl_reload_bool
! Missing $ inserted.
<inserted text>
$
l.82 \bool_
new:N \g__expl_reload_bool
! Undefined control sequence.
l.82 \bool_new:N \g
__expl_reload_bool
! Missing { inserted.
<to be read again>
_
l.82 \bool_new:N \g__
expl_reload_bool
! Undefined control sequence.
l.84 \tl
_if_exist:NF \c__expl_def_ext_tl
LaTeX Warning: Command \c invalid in math mode on input line 84.
! Missing $ inserted.
<inserted text>
$
l.84 \tl_if_exist:NF \c_
_expl_def_ext_tl
! Missing { inserted.
<to be read again>
}
l.84 \tl_if_exist:NF \c_
_expl_def_ext_tl
! Undefined control sequence.
l.85 { \tl
_const:Nn \c__expl_def_ext_tl { def } }
LaTeX Warning: Command \c invalid in math mode on input line 85.
! Missing $ inserted.
<inserted text>
$
l.85 { \tl_const:Nn \c_
_expl_def_ext_tl { def } }
! Missing { inserted.
<to be read again>
}
l.85 { \tl_const:Nn \c_
_expl_def_ext_tl { def } }
! Extra }, or forgotten $.
l.85 ...\tl_const:Nn \c__expl_def_ext_tl { def } }
! Undefined control sequence.
l.86 \cs
_gset_protected:Npn \__kernel_sys_configuration_load:n #1
! You can't use `macro parameter character #' in math mode.
l.86 ...d:Npn \__kernel_sys_configuration_load:n #
1
! Undefined control sequence.
l.89 \cs
_undefine:c { ver@ #1 .def }
! You can't use `macro parameter character #' in math mode.
l.89 \cs_undefine:c { ver@ #
1 .def }
! Argument of \@onefilewithoptions has an extra }.
<inserted text>
\par
l.93 }
Runaway argument?
] [ ] \c __expl_def_ext_tl \ExplSyntaxOn
! Paragraph ended before \@onefilewithoptions was complete.
<to be read again>
\par
l.93 }
! Missing $ inserted.
<inserted text>
$
l.93 }
! Missing } inserted.
<inserted text>
}
l.93 }
! Undefined control sequence.
l.94 \cs
_gset_protected:Npn \__kernel_sys_configuration_load_std:n #1
! You can't use `macro parameter character #' in math mode.
l.94 ...n \__kernel_sys_configuration_load_std:n #
1
! Undefined control sequence.
l.96 \cs
_undefine:c { ver@ #1 .def }
! You can't use `macro parameter character #' in math mode.
l.96 \cs_undefine:c { ver@ #
1 .def }
! Argument of \@onefilewithoptions has an extra }.
<inserted text>
\par
l.99 }
Runaway argument?
] [ ] \c __expl_def_ext_tl
! Paragraph ended before \@onefilewithoptions was complete.
<to be read again>
\par
l.99 }
! Missing $ inserted.
<inserted text>
$
l.99 }
! Missing } inserted.
<inserted text>
}
l.99 }
! Missing } inserted.
<inserted text>
}
l.99 }
! Undefined control sequence.
l.100 \clist
_if_exist:NF \l__expl_options_clist
LaTeX Warning: Command \l invalid in math mode on input line 100.
! Missing { inserted.
<to be read again>
_
l.100 \clist_if_exist:NF \l__
expl_options_clist
! Undefined control sequence.
l.101 { \clist
_new:N \l__expl_options_clist }
LaTeX Warning: Command \l invalid in math mode on input line 101.
! Missing { inserted.
<to be read again>
_
l.101 { \clist_new:N \l__
expl_options_clist }
! Undefined control sequence.
l.105 \keys
_define:nn { sys }
! Double subscript.
l.105 \keys_
define:nn { sys }
! Undefined control sequence.
l.109 { \sys
_load_backend:n {#1} } ,
! You can't use `macro parameter character #' in math mode.
l.109 { \sys_load_backend:n {#
1} } ,
! Undefined control sequence.
l.112 \sys
_load_debug:
! Undefined control sequence.
l.113 \debug
_on:n { check-declarations }
! You can't use `macro parameter character #' in math mode.
l.115 driver .meta:n = { backend = #
1 } ,
! Undefined control sequence.
l.117 \sys
_load_debug: ,
! Undefined control sequence.
l.120 \sys
_load_debug:
! Undefined control sequence.
l.121 \debug
_on:n { log-functions }
! Undefined control sequence.
l.124 = \g
__kernel_backend_header_bool ,
! Missing { inserted.
<to be read again>
_
l.124 = \g__
kernel_backend_header_bool ,
! Undefined control sequence.
l.128 \bool
_gset_true:N \g__kernel_deprecation_undo_recent_bool
! Undefined control sequence.
l.128 \bool_gset_true:N \g
__kernel_deprecation_undo_recent_bool
! Missing { inserted.
<to be read again>
_
l.128 \bool_gset_true:N \g__
kernel_deprecation_undo_recent_bool
! Undefined control sequence.
l.129 \sys
_load_deprecation:
! Undefined control sequence.
l.132 \cs
_if_exist:NF \@expl@sys@load@backend@@
! Undefined control sequence.
l.132 \cs_if_exist:NF \@expl@sys@load@backend@@
! Undefined control sequence.
l.134 \tl
_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing } inserted.
<inserted text>
}
l.134 \tl_put_left:Nn \document
! Missing $ inserted.
<inserted text>
$
l.134 \tl_put_left:Nn \document
! Extra \endgroup.
<recently read> \endgroup
l.134 \tl_put_left:Nn \document
(/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def)
(/home/joao/test.aux)
Overfull \hbox (1788.17528pt too wide) in paragraph at lines 77--134
[]\OT1/cmr/m/n/10 2020-10-05expl3.sty$[]\OML/cmm/m/it/10 ew \OT1/cmr/m/n/10 : \
OML/cmm/m/it/10 N[]$
! Missing } inserted.
<inserted text>
}
l.136 \endgroup
! Extra \endgroup.
<recently read> \endgroup
l.136 \endgroup
! Undefined control sequence.
l.137 \@expl@sys@load@backend@@
! Extra }, or forgotten \endgroup.
l.139 }
! Extra }, or forgotten \endgroup.
l.140 }
! Undefined control sequence.
l.141 \cs
_gset_protected:Npn \@expl@sys@load@backend@@
! Missing $ inserted.
<inserted text>
$
l.141 \cs_
gset_protected:Npn \@expl@sys@load@backend@@
! Undefined control sequence.
l.141 ...t_protected:Npn \@expl@sys@load@backend@@
! Undefined control sequence.
l.143 \str
_if_exist:NF \c_sys_backend_str
LaTeX Warning: Command \c invalid in math mode on input line 143.
! Missing $ inserted.
<inserted text>
$
l.143 \str_if_exist:NF \c_
sys_backend_str
! Missing { inserted.
<to be read again>
}
l.143 \str_if_exist:NF \c_
sys_backend_str
! Undefined control sequence.
l.144 { \sys
_load_backend:n { } }
! Extra }, or forgotten $.
l.145 }
! Undefined control sequence.
l.146 \keys
_set:nV { sys } \l__expl_options_clist
LaTeX Warning: Command \l invalid in math mode on input line 146.
! Missing { inserted.
<to be read again>
_
l.146 \keys_set:nV { sys } \l__
expl_options_clist
! Undefined control sequence.
l.147 \str
_if_exist:NF \c_sys_backend_str
LaTeX Warning: Command \c invalid in math mode on input line 147.
! Missing $ inserted.
<inserted text>
$
l.147 \str_if_exist:NF \c_
sys_backend_str
! Missing { inserted.
<to be read again>
}
l.147 \str_if_exist:NF \c_
sys_backend_str
! Undefined control sequence.
l.148 { \sys
_load_backend:n { } }
! Undefined control sequence.
l.149 \bool
_if:NT \g__expl_reload_bool
! Undefined control sequence.
l.149 \bool_if:NT \g
__expl_reload_bool
! Missing { inserted.
<to be read again>
_
l.149 \bool_if:NT \g__
expl_reload_bool
! Undefined control sequence.
l.151 \cs
_gset_eq:NN \__kernel_sys_configuration_load:n
! Undefined control sequence.
l.154 \file
_input_stop:
! Undefined control sequence.
l.156 \cs
_if_free:cTF { [email protected] }
! Undefined control sequence.
l.158 \tex
_everyjob:D \exp_after:wN
! Undefined control sequence.
l.160 \tex
_the:D \tex_everyjob:D
! Undefined control sequence.
l.160 \tex_the:D \tex
_everyjob:D
! Undefined control sequence.
l.161 \sys
_everyjob:
! Undefined control sequence.
l.164 { \sys
_everyjob: }
! Undefined control sequence.
l.165 \reverse
_if:N \if_cs_exist:N \s__expl_stop
! Undefined control sequence.
l.168 \cs
_if_exist:NF \@expl@push@filename@@
! Undefined control sequence.
l.168 \cs_if_exist:NF \@expl@push@filename@@
! Undefined control sequence.
l.170 \tl
_put_left:Nn \@pushfilename { \@expl@push@filename@@ }
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.170 \tl_put_left:Nn \@pushfilename
{ \@expl@push@filename@@ }
! Undefined control sequence.
l.170 ... \@pushfilename { \@expl@push@filename@@
}
! Undefined control sequence.
l.171 \tl
_put_right:Nn \@pushfilename { \@expl@push@filename@aux@@ }
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.171 \tl_put_right:Nn \@pushfilename
{ \@expl@push@filename@aux@@ }
! Undefined control sequence.
l.171 ...pushfilename { \@expl@push@filename@aux@@
}
! Undefined control sequence.
l.173 \cs
_gset_protected:Npn \@expl@push@filename@@
! Undefined control sequence.
l.173 ...gset_protected:Npn \@expl@push@filename@@
! Undefined control sequence.
l.177 \tl
_to_str:N \@currname .
! Undefined control sequence.
l.178 \tl
_to_str:N \@currext
! Undefined control sequence.
l.180 \tl
_put_left:Nx \l__expl_status_stack_tl
LaTeX Warning: Command \l invalid in math mode on input line 180.
! Missing { inserted.
<to be read again>
_
l.180 \tl_put_left:Nx \l__
expl_status_stack_tl
! Undefined control sequence.
l.182 \bool
_if:NTF \l__kernel_expl_bool
LaTeX Warning: Command \l invalid in math mode on input line 182.
! Missing { inserted.
<to be read again>
_
l.182 \bool_if:NTF \l__
kernel_expl_bool
! Undefined control sequence.
l.188 \cs
_gset_protected:Npn \@expl@push@filename@aux@@ #1#2#3
! Undefined control sequence.
l.188 ..._protected:Npn \@expl@push@filename@aux@@
#1#2#3
! You can't use `macro parameter character #' in math mode.
l.188 ...rotected:Npn \@expl@push@filename@aux@@ #
1#2#3
! You can't use `macro parameter character #' in math mode.
l.188 ...tected:Npn \@expl@push@filename@aux@@ #1#
2#3
! You can't use `macro parameter character #' in math mode.
l.188 ...cted:Npn \@expl@push@filename@aux@@ #1#2#
3
! Undefined control sequence.
l.190 \str
_gset:Nn \g_file_curr_name_str {#3}
! Undefined control sequence.
l.190 \str_gset:Nn \g
_file_curr_name_str {#3}
! You can't use `macro parameter character #' in math mode.
l.190 \str_gset:Nn \g_file_curr_name_str {#
3}
! You can't use `macro parameter character #' in math mode.
l.191 #
1 #2 {#3}
! You can't use `macro parameter character #' in math mode.
l.191 #1 #
2 {#3}
! You can't use `macro parameter character #' in math mode.
l.191 #1 #2 {#
3}
! Undefined control sequence.
l.193 \cs
_if_exist:NF \@expl@pop@filename@@
! Undefined control sequence.
l.193 \cs_if_exist:NF \@expl@pop@filename@@
! Undefined control sequence.
l.195 \tl
_put_right:Nn \@popfilename
! LaTeX Error: Can be used only in preamble.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.195 \tl_put_right:Nn \@popfilename
! Undefined control sequence.
l.196 { \@expl@pop@filename@@
}
! Undefined control sequence.
l.198 \cs
_gset_protected:Npn \@expl@pop@filename@@
! Undefined control sequence.
l.198 \cs_gset_protected:Npn \@expl@pop@filename@@
! Undefined control sequence.
l.201 \tl
_if_empty:NTF \l__expl_status_stack_tl
LaTeX Warning: Command \l invalid in math mode on input line 201.
! Missing { inserted.
<to be read again>
_
l.201 \tl_if_empty:NTF \l__
expl_status_stack_tl
LaTeX Warning: Command \l invalid in math mode on input line 203.
! Missing { inserted.
<to be read again>
_
l.203 ...{ \exp_after:wN \__expl_status_pop:w \l__
expl_status_stack_tl \s__e...
! Undefined control sequence.
l.203 ..._status_pop:w \l__expl_status_stack_tl \s
__expl_stop }
! Missing { inserted.
<to be read again>
_
l.203 ...tatus_pop:w \l__expl_status_stack_tl \s__
expl_stop }
! Undefined control sequence.
l.205 \cs
_gset_protected:Npn \__expl_status_pop:w #1#2 \s__expl_stop
! Double subscript.
l.205 \cs_
gset_protected:Npn \__expl_status_pop:w #1#2 \s__expl_stop
! You can't use `macro parameter character #' in math mode.
l.205 ...gset_protected:Npn \__expl_status_pop:w #
1#2 \s__expl_stop
! You can't use `macro parameter character #' in math mode.
l.205 ...et_protected:Npn \__expl_status_pop:w #1#
2 \s__expl_stop
! Undefined control sequence.
l.205 ...rotected:Npn \__expl_status_pop:w #1#2 \s
__expl_stop
! Missing { inserted.
<to be read again>
_
l.205 ...tected:Npn \__expl_status_pop:w #1#2 \s__
expl_stop
! Undefined control sequence.
l.207 \tl
_set:Nn \l__expl_status_stack_tl {#2}
LaTeX Warning: Command \l invalid in math mode on input line 207.
! Missing { inserted.
<to be read again>
_
l.207 \tl_set:Nn \l__
expl_status_stack_tl {#2}
! You can't use `macro parameter character #' in math mode.
l.207 \tl_set:Nn \l__expl_status_stack_tl {#
2}
! You can't use `macro parameter character #' in math mode.
l.208 \int_if_odd:nTF {#
1}
! Undefined control sequence.
l.212 \tl
_if_exist:NF \l__expl_status_stack_tl
! Double subscript.
l.212 \tl_
if_exist:NF \l__expl_status_stack_tl
LaTeX Warning: Command \l invalid in math mode on input line 212.
! Missing { inserted.
<to be read again>
_
l.212 \tl_if_exist:NF \l__
expl_status_stack_tl
! Undefined control se
最后编辑：事实证明，我的机器中某个地方安装了 TeX Live 2019，而 LaTeX 编辑器正在寻找该安装中的文件。所以我需要找到这个安装并删除与之对应的每个文件。