Can't open admin console after installing ZeXtras Migration Zimlet

I tried to install ZeXtras Migration Tool 1.6.4 on a Zimbra 6.0.16 (Centos 5 32 bits) open source server. The installation went fine and the zimlet shows up when I run:

$ zmzimletctl listZimlets
Installed Zimlet files on this host:
com_zextras_zxmig
..

But after the installation the admin console is not accessible anymore, the loading splash screens keeps loading. I see a javascript error showing up when i turn on chrome or firefox dev tools:
on line 5949 of zimlets-nodev_all.js.zgz.js
Error: Uncaught TypeError: Cannot read property 'force_view' of null

Javascript line:
var e=ZXBase.getInstance().getModuleInstance(module).force_view;

After uninstalling 1.6.4 with ./install -u all the admin console is accessible again. Any solutions for this problem?