Can't resolve build warning "Unable to find package, Instigator: { StartupSoftObjectPath }."

carrot stew
Thu, 31 Jul 2025 22:37:14 +0000
Platform & Builds

TLDR: How do you fix build warnings about missing packages that mention “Instigator: { StartupSoftObjectPath }” ?

I’m getting these missing package build warnings that aren’t resolved by the usual recommended methods:

Packaging (Windows): LogCook: Warning: Unable to find package for cooking /Game/FirstPerson/Input/MobileControls. Instigator: { StartupSoftObjectPath }.
Packaging (Windows): LogCook: Warning: Unable to find package for cooking /Game/ABlueprints/BP_MagnetizerProjectile. Instigator: { StartupSoftObjectPath }.
Packaging (Windows): LogCook: Warning: Unable to find package for cooking /Game/ABlueprints/BP_MagneticObject. Instigator: { StartupSoftObjectPath }.

The MobileControls thing was deleted. The other two were moved to a different folder. All the above was done a few weeks ago so the editor/project has been saved, reloaded, and fixed redirectors many times since.

Some recommended fixes from other posts that did not work:

1. Fixing up redirectors

2. Checking for ghost versions of those files in the project folder in Windows Explorer and manually deleting them. Found no files anywhere in the project to delete in the first place.

3. Deleting DerivedDataCache folder and rebuilding

4. Enabling “Full Rebuild” in project settings

5. Searching through .ini files in order to update paths manually. I found no references to these assets anywhere in the .ini files.

I previously had some of the more common “missing package” type warnings earlier that were resolved by these suggestions.

Now only these warnings that included “Instigator: StartupSoftObjectPath” remain, which feels significant, but I can’t find any posts about this specifically.

Looking for further suggestions and info. What is this “StartupSoftObjectPath” referring to?

2 posts - 2 participants