understand this script in depth, then fix this error : it says Starting initial unknown scan for enemy X position...
Error:[string "-- Function to read a 32-bit integer from mem..."]:19: attempt to index a nil value (local 'foundlist') the code is -- Function to read a 32-bit integer from memory
function readInt(address)
    return tonumber(readInteger(address))
end

-- Function to write a 32-bit integer to memory
function writeInt(address, value)
    writeInteger(address, value)
end

-- Function to perform an initial unknown value scan
function initialScanUnknown(scanOption)
    local memscan = createMemScan()

    -- Start the initial scan with the correct scan option
    memscan.FirstScan(scanOption, vtDword, "", 0, 0, "", "", "")

    local foundlist = memscan.FoundList
    foundlist.Initialize()

    memscan.destroy()

    if foundlist and foundlist.Count > 0 then
        return true, foundlist
    else
        return false, nil
    end
end

-- Function to perform a narrow down unknown value changed scan
function narrowDownScanUnknown(foundlist, scanOption)
    local memscan = createMemScan()

    -- Begin the narrow down scan with the correct scan option
    memscan.BeginScan(foundlist, scanOption, vtDword, "", 0, 0, "", "", "")
    memscan.UpdateScan()

    local newFoundList = memscan.FoundList
    newFoundList.Initialize()

    memscan.destroy()

    if newFoundList and newFoundList.Count > 0 then
        return true, newFoundList
    else
        return false, nil
    end
end

-- Function to find a unique address by repeatedly narrowing down the scan
function findUniqueAddress(initialScanOption, narrowScanOption, promptMessage)
    -- Perform initial scan
    local success, foundlist = initialScanUnknown(initialScanOption)
    if not success then
        print("Initial scan failed.")
        return nil
    end

    -- Repeat narrowing down until one address is found or no results remain
    while foundlist.Count > 1 do
        print(promptMessage)
        -- Wait for user input to proceed (manual change in game state)
        io.read()

        -- Perform narrow down scan
        local successNarrow, newFoundList = narrowDownScanUnknown(foundlist, narrowScanOption)
        if not successNarrow then
            print("Narrow down scan failed.")
            foundlist.destroy()
            return nil
        end

        -- Destroy previous found list and update to new one
        foundlist.destroy()
        foundlist = newFoundList
    end

    -- Check if exactly one result is found
    if foundlist.Count == 1 then
        local address = foundlist.Address[0]
        foundlist.destroy()
        return address
    else
        print("Failed to uniquely identify the address.")
        foundlist.destroy()
        return nil
    end
end

-- Function to find the enemy's position
function findEnemyPosition()
    print("Starting initial unknown scan for enemy X position...")
    local enemyXAddress = findUniqueAddress(soUnknownInitialValue, soUnknownValueChanged, "Change the enemy's position in-game and press Enter...")
    if not enemyXAddress then
        print("Failed to find enemy position.")
        return nil, nil, nil, nil
    end

    print(string.format("Enemy X Address Found: 0x%X", enemyXAddress))

    -- Read Y and Z positions based on known offsets
    local enemyYAddress = enemyXAddress + 4
    local enemyZAddress = enemyXAddress + 8

    local enemyX = readInt(enemyXAddress)
    local enemyY = readInt(enemyYAddress)
    local enemyZ = readInt(enemyZAddress)

    print(string.format("Enemy Position: X=%d, Y=%d, Z=%d", enemyX, enemyY, enemyZ))
    return enemyX, enemyY, enemyZ, enemyXAddress
end

-- Function to find the player's aim position
function findPlayerAimPosition()
    print("Starting initial unknown scan for player aim X position...")
    local playerAimXAddress = findUniqueAddress(soUnknownInitialValue, soUnknownValueChanged, "Change the player's aim in-game and press Enter...")
    if not playerAimXAddress then
        print("Failed to find player aim position.")
        return nil, nil, nil, nil
    end

    print(string.format("Player Aim X Address Found: 0x%X", playerAimXAddress))

    -- Read Y and Z positions based on known offsets
    local playerAimYAddress = playerAimXAddress + 4
    local playerAimZAddress = playerAimXAddress + 8

    local playerAimX = readInt(playerAimXAddress)
    local playerAimY = readInt(playerAimYAddress)
    local playerAimZ = readInt(playerAimZAddress)

    print(string.format("Player Aim Position: X=%d, Y=%d, Z=%d", playerAimX, playerAimY, playerAimZ))
    return playerAimX, playerAimY, playerAimZ, playerAimXAddress
end

-- Function to calculate the aim offset
function calculateAimOffset(enemyX, enemyY, enemyZ, playerAimX, playerAimY, playerAimZ)
    -- Calculate the offset to aim at the enemy's head
    local offsetX = enemyX - playerAimX
    local offsetY = enemyY - playerAimY
    local offsetZ = enemyZ - playerAimZ

    -- Adjust the aim (this is a simple example, you may need to fine-tune the values)
    local newAimX = playerAimX + offsetX
    local newAimY = playerAimY + offsetY
    local newAimZ = playerAimZ + offsetZ

    return newAimX, newAimY, newAimZ
end

-- Main loop
while true do
    ::continue:: -- Label moved to the beginning of the loop

    -- Find the enemy's position
    local enemyX, enemyY, enemyZ, enemyXAddress = findEnemyPosition()
    if not enemyX or not enemyY or not enemyZ then
        print("Failed to find enemy position. Retrying in 1 second...")
        sleep(1000) -- Sleep for 1 second
        goto continue
    end

    -- Find the player's aim position
    local playerAimX, playerAimY, playerAimZ, playerAimXAddress = findPlayerAimPosition()
    if not playerAimX or not playerAimY or not playerAimZ then
        print("Failed to find player aim position. Retrying in 1 second...")
        sleep(1000) -- Sleep for 1 second
        goto continue
    end

    -- Calculate the aim offset
    local newAimX, newAimY, newAimZ = calculateAimOffset(enemyX, enemyY, enemyZ, playerAimX, playerAimY, playerAimZ)

    -- Write the new aim position back to memory
    writeInt(playerAimXAddress, newAimX)
    writeInt(playerAimXAddress + 4, newAimY)
    writeInt(playerAimXAddress + 8, newAimZ)

    print(string.format("Aim adjusted to X=%d, Y=%d, Z=%d", newAimX, newAimY, newAimZ))

    -- Sleep to avoid high CPU usage
    sleep(10) -- Sleep for 10 milliseconds
end