It looks to me like all your errors listed here, are produced by not having the permission to open the log file. You'd have to set the file's permissions to writable for all. If you can't touch it where it is supposed to be, use a location of your own choice, for example in your home directory or in a dedicated subdirectory, and set the permissions accordingly. If the directory doesn't allow you to create a file, and it's unwise to allow it, make an empty file by hand with the proper name, set its permissions, and try again.