Discord button give role - bot in python

I'm trying to make my bot send a message with buttons to select the role you want according to the button, but I admit having trouble after various attempts, currently I have this type of error :

Traceback (most recent call last):
  File "C:\Users\Entys\AppData\Local\Programs\Python\Python39\lib\site-packages\discord\ui\view.py", line 425, in _scheduled_task
    await item.callback(interaction)
TypeError: 'coroutine' object is not callable

As for my code, I show you the part concerned (I announce that there are parts in French, because I am and the goal is for this purpose)

 async def printclass(self, ctx):
        async def button_callclassa(interaction):
            await interaction.check_classA(ctx)

        buttonA = Button(label="Classe A", style=discord.ButtonStyle.primary)
        buttonA.callback = button_callclassa(ctx)

        view = View(timeout=None)
        view.add_item(buttonA)

        await ctx.send("**Choisis ta classe :**", view=view)

    async def check_classA(self, ctx):
        user = discord.Member
        roleA = discord.utils.find(lambda r: r.name == 'Classe A', ctx.message.guild.roles)
        roleB = discord.utils.find(lambda r: r.name == 'Classe B', ctx.message.guild.roles)
        roleC = discord.utils.find(lambda r: r.name == 'Classe C', ctx.message.guild.roles)
        if roleA not in user.roles and roleB not in user.roles and roleC not in user.roles:
            await ctx.add_roles(user, 'Classe A')
        else:
            await ctx.remove_roles(user, 'Classe A')
            await ctx.remove_roles(user, 'Classe B')
            await ctx.remove_roles(user, 'Classe C')
            await ctx.add_roles(user, 'Classe A')