So, I bought a new pc re-imported everything from my old one, and when I tried to run my mod I just saw this : 

Spoiler

Exception in thread "main" java.lang.IllegalArgumentException: Environment variable 'assetDirectory' must be set to a valid path.
	at net.minecraftforge.userdev.LaunchTesting.main(LaunchTesting.java:70)

I also got this :

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by net.minecraftforge.userdev.LaunchTesting (file:/C:/Users/Victor/.gradle/caches/forge_gradle/minecraft_user_repo/net/minecraftforge/forge/1.15.2-31.1.30_mapped_snapshot_20200331-1.15.1/forge-1.15.2-31.1.30_mapped_snapshot_20200331-1.15.1-recomp.jar) to method java.lang.ClassLoader.initializePath(java.lang.String)
WARNING: Please consider reporting this to the maintainers of net.minecraftforge.userdev.LaunchTesting
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

 

Can anybody help me, because this is my first time seeing this error message.

Edited June 7, 20205 yr by Anonomys

What version of Forge and what IDE are you using?

1.15.2

1 minute ago, sciwhiz12 said:

what IDE are you using?

 

The problem is, that, as it says in the exception message, an environment variable isn't set properly.

I think assetDirectory should point to your asset directory, which is most probably not the case.

I remember that it was a pain to switch the location of the mod files back when I developed in MC version 1.12.2, because Eclipse had some problems finding the right folders etc.

But that shouldn't be a problem anymore.

Edited June 7, 20205 yr by Budschie

It seems that you moved the files, but you haven't refreshed your launch files for your IDE.

Remove the old launch files, then run:

For Eclipse: gradlew genEclipseRuns

For IDEA: gradlew genIntellijRuns

For VS Code: gradlew genVSCodeRuns

The second error is, if I am correct, from running the Forge dev client/server on Java 9+. It can be safely ignored.

okay thanks.