# Unreal Engine 4.27 Preview

**URL:** <https://forums.unrealengine.com/t/unreal-engine-4-27-preview/234295>\
**Category:** Announcements\
**Tags:** unreal-engine, UE4-27\
**Created:** [June 8, 2021, 3:00pm UTC](https://forums.unrealengine.com/t/unreal-engine-4-27-preview/234295 "2021-06-08T15:00:44Z")\
**Posts on this page:** 1\
**Showing post:** 193

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**Author:** ![motorsep](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/motorsep/32/918698_2.png) [@motorsep](https://forums.unrealengine.com/u/motorsep)\
**Post date:** [August 10, 2021, 3:48am UTC](https://forums.unrealengine.com/t/unreal-engine-4-27-preview/234295/193 "2021-08-10T03:48:38Z")

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Ugh, another issue when building for forward Android Vulkan:

[vulkan.txt.txt](https://forums.unrealengine.com/uploads/short-url/fuZqKx3qr9picS2WJogKXmIwpgh.txt) (8.7 KB)

The gist of it:

> UATHelper: Packaging (Android (ASTC)): LogWindows: Error: === Critical error: ===  
> UATHelper: Packaging (Android (ASTC)): LogWindows: Error:  
> UATHelper: Packaging (Android (ASTC)): LogWindows: Error: Assertion failed: CompressedFormat == PF\_Unknown || CompressedFormat == CompressedMip[0].PixelFormat [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/VT/VirtualTextureDataBuilder.cpp] [Line: 676]

Settings of my RVT:

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/3X/2/2/2208ff9763e2ee585c14db9fa849c682a31262f9.png)

Even if I switch from YCoGg to regular content, I still get the same error and project won’t build for Android Vulkan x64 😕

Any idea ?

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_[View the full topic](https://forums.unrealengine.com/t/unreal-engine-4-27-preview/234295)._