i dont know what has happen pls help

Development Programming & Scripting
, ,
1

CommandletException: Editor terminated with exit code 1 while running Cook for D:\UnrealEngine5\UnrealEngine5 Projects\Blightfel\Blightfel.uproject; see log C:\Users\jacki\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+UnrealEngine5+UE_5.7\Cook-2026.09.01-03.55.56.txt

at AutomationTool.CommandUtils.FinishRunCommandlet(FileReference ProjectFile, String Commandlet, DateTime StartTime, IProcessResult RunResult, String LocalLogFile, String& DestLogFile, UInt32 ErrorLevel)
at AutomationTool.CommandUtils.RunCommandlet(FileReference ProjectFile, String UnrealExe, String Commandlet, String Parameters, String& DestLogFile, UInt32 ErrorLevel)
at AutomationTool.CommandUtils.RunCommandlet(FileReference ProjectFile, String UnrealExe, String Commandlet, String Parameters, UInt32 ErrorLevel)
at AutomationTool.CommandUtils.CookCommandlet(FileReference ProjectFile, String UnrealExe, String Maps, String Dirs, String InternationalizationPreset, String CulturesToCook, String TargetPlatform, String Parameters)
at AutomationScripts.Project.Cook(ProjectParams Params)Wrapped by AutomationException: Cook failed.
at AutomationScripts.Project.Cook(ProjectParams Params)
at BuildCookRun.DoBuildCookRun(ProjectParams Params)
at BuildCookRun.ExecuteBuild()
at AutomationTool.BuildCommand.Execute()
at AutomationTool.BuildCommand.ExecuteAsync()
at AutomationTool.Automation.ExecuteAsync(List1 CommandsToExecute, Dictionary2 Commands)
at AutomationTool.Automation.ExecuteAsync(List1 CommandsToExecute, Dictionary2 Commands)
at AutomationTool.Automation.ProcessAsync(ParsedCommandLine AutomationToolCommandLine, StartupTraceListener StartupListener, HashSet`1 ScriptModuleAssemblies)

AutomationTool executed for 0h 16m 57s
AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)

2

hey! so exitcode 25 / commandlet error 1 just means the cook process crashed, but this log line only shows that it failed, not the actual reason why it crashed.

first thing u should do is open up that log file it mentioned:

C:\Users\jacki\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+UnrealEngine5+UE_5.7\Cook-2026.09.01-03.55.56.txt

scroll all the way down to the bottom or ctrl+f for Error: or Fatal error. it’s almost always a corrupted asset, a blueprint with an unresolved error, or a missing reference somewhere.

a few quick things that usually fix this for me:

  1. Delete cache folders: close unreal, go to D:\UnrealEngine5\UnrealEngine5 Projects\Blightfel\ and delete Intermediate, Saved, and DerivedDataCache. then reopen the project and try cooking again.
  2. Fixup redirectors: in content browser, right click your Content folder and hit “Fix Up Redirectors in Folder”.
  3. Map list: check your Project Settings → Packaging and make sure your map list is setup right. if its empty, UE tries to cook every test map and plugin map in the project which breaks super easily.

if none of that works post the last ~30 lines of that cook log file here so we can see what asset actually threw the error!