We recently upgraded to 1.424.1 LTS, and switched to the EnvInject plugin instead of the deprecated "Hudson SetEnv" plugin to set environment variables for our jobs.

All our multi-configuration jobs are now failing:

[EnvInject] - [ERROR] - [EnvInject] - [ERROR] - Problems occurs on injecting env vars as a build step: hudson.matrix.MatrixConfiguration cannot be cast to hudson.model.TopLevelItem

This is easy to reproduce:

• Install EnvInject
• Create a new multiconfiguration job
• Add an axis named "axis" with the values "a b c"
• Add an execute shell build step consisting of "echo $axis"
• Save and run the job (it should execute successfully against three configurations)
• Now, edit the job and check "Inject environment variables to the build process" in the Build Environment section. You don't actually need to add any properties content to reproduce the problem--just check the checkbox.
• Run the job again. All three configurations fail.

This is a big problem for us as all our multi-configuration jobs also use environment variables.