The directory is not the problem.
The problem is the slave. I don't know why they did such long name, and what they use to create those files because I don't think it is possible with the workbench even with PFS3.
The problem is (example):
AlienBreedTowerAssaultAGA.Slave (31 chars)
I can't check if this file exist because of its long size.
So I use a workaround.
The next build is going to work again.