Hello all, I was following this bug from the beginning as I faced the same problem.
It was fixed today on my machine after I installed the following package : libgnomevfs2-extra The previous answer showed a simple script to reproduce the error that I used to feed the "strace command". In the output I could see the error was preceeded with the following: time(NULL) = 1187095024 stat64("/home/DaBoss/.gnome2/vfs/modules", 0xbfd79ccc) = -1 ENOENT (No such file or directory) stat64("/etc/gnome-vfs-2.0/modules", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0 time(NULL) = 1187095024 write(2, "Can\'t call method \"to_string\" on"..., 76Can't call method "to_string" on an undefined value at ./pscript.pl line 5. ) = 76 exit_group(2) = ? This led me to consider a missing extension. I checked with : apt-cache search gnome vfs module from the list I picked "libgnomevfs2-extra". Problem solved !! I think one should add this package to the dependency list. Regards, Silvère THOMMEREL