Was exporting a project, (about 10 gb.) and got an unknown cook failure. I am using Unreal Engine 4.27.2 and it packages any other project perfectly fine.
Here is a partial part of the log files:
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: NOTE: Only first 50 warnings displayed.
UATHelper: Packaging (Windows (64-bit)): LogInit: Display:
UATHelper: Packaging (Windows (64-bit)): LogInit: Display: Failure - 57 error(s), 2608 warning(s)
UATHelper: Packaging (Windows (64-bit)): LogInit: Display:
UATHelper: Packaging (Windows (64-bit)):
UATHelper: Packaging (Windows (64-bit)): Execution of commandlet took: 29.10 seconds
UATHelper: Packaging (Windows (64-bit)): LogShaderCompilers: Display: === FShaderJobCache stats ===
UATHelper: Packaging (Windows (64-bit)): LogShaderCompilers: Display: Total job queries 0, among them cache hits 0 (0.00%)
UATHelper: Packaging (Windows (64-bit)): LogShaderCompilers: Display: Tracking 0 distinct input hashes that result in 0 distinct outputs (0.00%)
UATHelper: Packaging (Windows (64-bit)): LogShaderCompilers: Display: RAM used: 0.00 MB (0.00 GB) of 3276.80 MB (3.20 GB) budget. Usage: 0.00%
UATHelper: Packaging (Windows (64-bit)): LogShaderCompilers: Display: ================================================
UATHelper: Packaging (Windows (64-bit)): LogHttp: Display: cleaning up 0 outstanding Http requests.
UATHelper: Packaging (Windows (64-bit)): LogContentStreaming: Display: There are 1 unreleased StreamingManagers
UATHelper: Packaging (Windows (64-bit)): Took 35.798194s to run UE4Editor-Cmd.exe, ExitCode=1
UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed.
UATHelper: Packaging (Windows (64-bit)): (see C:\Users\adria\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+(x86)+Epic+Games+UE_4.27\Log.txt for full exception trace)
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure