Is it possible to use a task inside another task environment?

Question

I am trying to put a task inside another task environment (I am very impressed that nobody has asked this), but it does not work:

\begin{tasks}(1)
    \task Task a)
    \task Task b)
    \begin{tasks}(1)
        \task Task b)1 % or b)1)  ,  or b1)  ,  something like that.
    \end{tasks}
    \task Task c)
\end{tasks}

When I compile I have 7 errors.

---

Instead of that, I use the inparaenum environment. For example:

\begin{tasks}(1)
    \task Task a)
    \task Task b)

    \begin{inparaenum}[b1)]
        \item Item b1)
        \hfil
        \item Item b2)
        \\
        \item Item b3)
        \hfil
        \item Item b4)
    \end{inparaenum}
    \task Task c)
\end{tasks}

Note that between \item Task b and \begin{inparaenum}[b1)] I added a line break because if not, the text appears immediately after Task b).

But if I run this code:

\begin{tasks}(1)
    \task Task a)

    \begin{inparaenum}[a1)]
        \item Item a1) % it says: 11) Item a1)
        \hfil
        \item Item a2) % it says: 22) Item a2)
        \\
        \item Item a3) % it says: 33) Item a3)
        \hfil
        \item Item a4) % it says: 44) Item a4)
    \end{inparaenum}
    \task Task b)
    \task Task c)
\end{tasks}

I get the following warning:

Package paralist Warning: Incorrect label; no or multiple counters.
(paralist)                The label is: a1) on input line 2435.

For that reason I do not want to work with the inparaenum environment, but yes with the task environment haha. I would like to work with a task within another task. Does anyone know if this is possible?

If not, I would like to solve the second problem.

Thanks!

EDIT:

I have this code now:

\documentclass[11pt]{article}
\usepackage{tasks}

\begin{document}

\begin{enumerate}
    \item 1.
    \item 2.
    \item 3.
    \begin{tasks}(1)
        \task a)
        {\begin{tasks}(2)
            \task a1)
            \task a2)
            \task a3)
            \task a4)
        \end{tasks}}
        \task b)
        \task c)
    \end{tasks}
    \item 4.
    \begin{tasks}(3)
        \task a)
        \task b)
        \task c)
    \end{tasks}
\end{enumerate}

\end{document}

When I compile I get:

And a Bad Box's message:

Overfull \hbox (27.37506 too wide) in paragraph at lines 22--22

How could I fix those 2 errors?

Answer 1

It is not possible to nest a tasks environment in another tasks, but it can be nested in enumerate. As your outer tasks has only one column, here is, hopefully, a solution with enumitem:

\documentclass[11pt]{article}
\usepackage{enumitem} 
\usepackage{tasks}

\begin{document}

\settasks{counter-format =\alph{enumi}tsk[1]), label-width = 1.5em, before-skip = -1ex}
\begin{enumerate}[label = \alph*), wide, leftmargin = *, itemsep = 1ex, after = \setcounter{enumi}{0}]
    \item Task A
    \item Task B

  \begin{tasks}(2)
 \task Item b1)
 \task Item b2)
 \task Item b3)
 \task Item b4)
 \end{tasks}
    \item Task C \begin{tasks}(2)
 \task Item b1)
 \task Item b2)
 \task Item b3)
 \task Item b4)
 \end{tasks}
\end{enumerate}

\end{document}