Another problem

# calculation code
def calculate(expr):
    x = expr.replace('x', '*')
    x = x.replace('÷', '/')
    answr = ''
    try:
        answr = str(eval(x))
    except:
        answr = "```Oops! I went Brainded. Try again Later.```"
    
    return answr
       
       
       
       
       
       
       
       
       
       
       
       
       
       msg = await ctx.reply(content="Calculator is Starting...")
        await asyncio.sleep(1.0)
        expr = '```None```'
        deathEmbed = discord.Embed(title="<a:alienalien:870611180232769596> Wasted!", description="Your calculator's ded. Sadly it's battery lasts only for 3 minutes. Try creating another calculator.")
        deathEmbed.set_thumbnail(url='https://i.ytimg.com/vi/mm1EGefKyqY/maxresdefault.jpg')
        tdelta = datetime.utcnow() + timedelta(minutes=3)
        embed = discord.Embed(title=f"<:calculator:870610558188126229> {ctx.author.name}'s Personal Calculator", description=expr, timestamp=tdelta, color=discord.Color.dark_magenta())
        await msg.edit(
            content='', components=Buttons, embed=embed
        )
        # <a:alienalien:870611180232769596> Your Calculator is now Dead.
        try:
            while msg.created_at < tdelta:
                res = await self.client.wait_for('button_click', timeout=180)
                if res.author.id == ctx.author.id and res.message.embeds[0].timestamp < tdelta:
                    expr = f"{res.message.embeds[0].description}".replace("`", '')
                    #print(expr)
                    if expr == 'None' or expr == "```Oops! I went Brainded. Try again Later.```":
                        expr = ''
                    if res.component.label == 'Quit':
                        await res.respond(
                            content='<a:alienalien:870611180232769596> You have quitted your calculator.', type=7, components=KillButtons
                        )
                        break
                    elif res.component.label == 'BckSpce':
                        expr = expr[:-1]
                    elif res.component.label == 'ClrScrn':
                        #expr = None
                        expr = None
                    elif res.component.label == 'Answr':
                        expr = calculate(expr)
                    else:
                        expr += res.component.label
                        #print(expr)    
                    emptyembed = discord.Embed(title=f"<:calculator:870610558188126229> {res.author.name} | Calculating...", description=f"```{expr}```", timestamp=tdelta, color=discord.Color.dark_blue())
                    await res.respond(content='', embed=emptyembed, components=Buttons, type=7)