Context: I'm updating my dev environment from 1.9 to 1.9.4 - project built successfully previously with 12.16.1.1907 / snapshot_nodoc_20160512

I've updated to build against 12.17.0.1957 / snapshot_20160601

 

I call gradlew.bat setupDecompWorkspace --refresh-dependencies

 

Applying SpecialSource...

Applying Exceptor...

:decompileMc FAILED

 

FAILURE: Build failed with an exception.

 

* What went wrong:

Execution failed for task ':decompileMc'.

> java.lang.NullPointerException (no error message)

 

I've tried various other versions of Forge from .1922 up; what did I mess up when upgrading?

i had this same problem..it was because I hadn't updated my gradle buildscript to use ForgeGradle 2.2

 

was:

    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT'
    }

 

worked after I changed it to:

    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.2-SNAPSHOT'
    }

i had this same problem..it was because I hadn't updated my gradle buildscript to use ForgeGradle 2.2

 

was:

    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.1-SNAPSHOT'
    }

 

worked after I changed it to:

    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:2.2-SNAPSHOT'
    }

 

Ding ding ding ding! A winar is you! Serves me right for not double checking the MCP.