Error : placeBlock()

[Fusyony]

Minecraft-Server-Version : 1.16.5 / 1.15

Hello, i'm trying to use the placeBlock() function of Mineflayer but actually it allways trow me this
Error: No block has been placed : the block is still air

I have try to use the example of the mineflayer-pathfinder without succes and of course my own code :
`

const { Vec3 } = require('vec3')
async function placeBlock(block_name, vect3, botClass) 
{
    return new Promise( async function (resolve) {

    const item = await botClass.bot.inventory.findInventoryItem(botClass.mcData.itemsByName[block_name].id)

    if (item) {
        const block = await botClass.bot.findBlock({
            matching: ['grass_block', 'sand', 'gravel'].map(blockName => botClass.mcData.blocksByName[blockName].id),
            useExtraInfo: block => {
                const hasAirAbove = botClass.bot.blockAt(block.position.offset(0, 1, 0)).name === 'air'
                const botNotStandingOnBlock = block.position.xzDistanceTo(botClass.bot.entity.position) > 2
                return hasAirAbove && botNotStandingOnBlock
            }
        })

        await botClass.bot.equip(item, 'hand')
        await botClass.bot.lookAt(block.position, true)
        await botClass.bot.placeBlock(block, new Vec3(0, 1, 0))
        .catch(err => {console.log(err)})
    } else {
        botClass.bot.say(`I don't have any ${block_name}`)
    }
    resolve()
})

}`

I don't know what's wrong with my code and what to do for be able to use the placeblock function ...
someone now how to use it ?