It gives just such an error, Google has not found an answer. Help me please.
The program code itself
\documentclass[11pt]{combine}
\usepackage[utf8]{inputenc}
\usepackage[english,russian]{babel}
\usepackage{indentfirst}
\usepackage{misccorr}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage[export]{adjustbox}
\title{Лабораторная работа №1}
\begin{document}
\pagestyle{combine}
\maketitle
\tableofcontents
\clearpage
\begin{papers}
\coltoctitle{HelloWorld}
\label{HelloWorld}
\import{HelloWorld}
\coltoctitle{KursTitle}
\label{KursTitle}
\import{KursTitle}
\coltoctitle{kurs}
\end{papers}
\end{document}
and errors
> ! Extra \endgroup. \document ->\endgroup
> \let \mainjobname \jobname \def \c@lmainauxfile {\jobn... l.10 \begin{document}
> ?