Looks like you don't have permissions to write in bmax, or one if its subfolders.
You can change permissions for files and folders using chmod.
For example "chmod u+wrX /<path>/<bmax folder> -R" will give the owner all (write, read, execute) rights to bmax and all subfolders and files in it.
Chmod might fail if you installed bmax as root, or some other user, so you don't have rights to change them.
To change ownership of folders/files switch user to root and run "chown <user>:<group> /<path>/<bmax folder> -R", logout root and try chmod again.
You can change permissions for files and folders using chmod.
For example "chmod u+wrX /<path>/<bmax folder> -R" will give the owner all (write, read, execute) rights to bmax and all subfolders and files in it.
Chmod might fail if you installed bmax as root, or some other user, so you don't have rights to change them.
To change ownership of folders/files switch user to root and run "chown <user>:<group> /<path>/<bmax folder> -R", logout root and try chmod again.