vkCreateSwapchainKHR Fail

Even though validation layers and debug callback extensions enabled and working (they respond to wrong structs etc.), I’m still getting a “VK_ERROR_VALIDATION_FAILED_EXT” result from vkCreateSwapchainKHR(), and there’s no validation layer error to pinpoint the mistake…
Swap chain creation (using GTX 970 ) :

VkBool32 isSupported = false;
vkGetPhysicalDeviceSurfaceSupportKHR( physicalDevices[0], 0, surface, &isSupported);

if (!isSupported) {
    std::cout << "*ERROR* This device doesn't support surfaces" << std::endl;
}

VkSurfaceCapabilitiesKHR surfCaps;
vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physicalDevices[0], surface, &surfCaps);

std::vector<VkSurfaceFormatKHR> deviceFormats;
uint32_t formatCount;
vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevices[0], surface, &formatCount, nullptr);
deviceFormats.resize(formatCount);
vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevices[0], surface, &formatCount, deviceFormats.data());


swapChainInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
swapChainInfo.pNext = nullptr;
swapChainInfo.flags = 0;
swapChainInfo.surface = surface;

swapChainInfo.minImageCount = surfCaps.minImageCount; 
swapChainInfo.imageFormat = VK_FORMAT_B8G8R8A8_UNORM;
swapChainInfo.imageColorSpace = VK_COLOR_SPACE_SRGB_NONLINEAR_KHR;
swapChainInfo.imageExtent = surfCaps.currentExtent;
swapChainInfo.imageArrayLayers = 1;
swapChainInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
swapChainInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;

swapChainInfo.queueFamilyIndexCount = 0;
swapChainInfo.pQueueFamilyIndices = VK_NULL_HANDLE;
swapChainInfo.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR; 
swapChainInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
swapChainInfo.presentMode = VK_PRESENT_MODE_FIFO_KHR;
swapChainInfo.clipped = VK_TRUE; // TODO : TEST clipping against another window
swapChainInfo.oldSwapchain = VK_NULL_HANDLE;

result = vkCreateSwapchainKHR( device, &swapChainInfo, nullptr, &swapChain );
if (result) {
    std::cout << "*ERROR* Swapchain Creation Failed :" << result << std::endl;
}

Solution : https://stackoverflow.com/questions/41379529/wat-does-the-vkcreateswapchainkhrinternal-drawable-creation-failed-means