Can't strip changesets from repo

Hi,

It seems that for a few days, I can't strip changesets on my repo.
Case: I want to remove the e6a396c commit.
Response:

Strip complete

Bundle file not created.

and as I change page, I get a notification error:

There was an error while executing the strip task.

The repo is : efolio/nodejsparis
Could you check it out please ?

Thanks in advance,