Vulkan c3861 vkCreateBuffer

[fds_1967]

Hello,
i'm trying to transfert my windows visual studio 2019 vulkan program in qt 6.0 environement. Most of the vulkan functions used are well reconnised by qt VK_CHECK_RESULT for sample but vkCreateBuffer, vkGetBufferMemoryRequirements,vkAllocateMemory... raised a build issue c3861 : undeclared identifier i include :
#include <QVulkanInstance>
#include <QVulkanFunctions>
#include <QVulkanDeviceFunctions>
#include <QVulkanExtension>

" OK "
vkGetBufferMemoryRequirements(device, stagingBuffers.indices.buffer, &memReqs);
" .......... OK........................ " " ERROR "
............. | | ................................... | |
............ \ /...................................\ /
VK_CHECK_RESULT(vkAllocateMemory(device, &memAlloc, nullptr, &stagingBuffers.indices.memory));

in my solution does some could tell me how to process to remove this issues.