Magma on 3.10

[Esteban Lorenzano]

Hi,
I just installed magma on a squeak-dev image (from Damien Cassou) based 
on build 7159 (latest 3.10 image)

I load packages "magma client 1.0 (r40)", "magma server 1.0 (r40)" and 
"magma tester 1.0 (r40)" from universes and executed first "getting 
started" code, with a very simple modification:

 MagmaRepositoryController
    create: (FileDirectory default directoryNamed: 'repository') fullName
    root: Dictionary new

executing this code throws a doesNotUnderstood: #open on ByteString. 
The message call comes from MaFileStreamPool>>renewAccess:

Same code executed on a 3.9 image (from Damien Cassou, too) works fine.
Is there a possible solution for this? i really need to run magma on 
3.10 images.

Thanks,
Esteban