[Freesurfer] Freeview error

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Dear Freesurfer devs,

I tried to open the brainmask.mgz file in freeview but I obtained this error:

mghRead(/usr/local/freesurfer/subjects/4227/mri/brainmask.mgz, -1): could not open file MRIread failed: Unable to read from /usr/local/freesurfer/subjects/4227/mri/brainmask.mgz mghRead(/usr/local/freesurfer/subjects/4227/mri/brainmask.mgz, -1): could not open file

Any suggestion about what could be the problem?, maybe the write permissons of the freesurfer folder?

I am using the freesurfer-Linux-centos6_x86_64-stable-pub-v6.0.0-2beb96c version that is installed in a Ubuntu 18.04 virtual machine. It is very strange because few weeks ago everything it was working correctly.

Thanks in advance.

Best regards,