I found the bug of the SandBox installer. (without seeing the code, just result of SQL installer ...
In my Projet, HPC7000, I ve a table named 'reseaux' with 3 fields (id, name, vlan_id).
'name' and 'vlan_id' are Unique so I checked Required and Unique in Properties => SandBox Crash!
Bug is here :
JInstaller: :Install: Error SQL DB function failed with error number 1071
Specified key was too long; max key length is 1000 bytes SQL=CREATE TABLE IF NOT EXISTS `[PREFIX]demo9139_reseaux` ( `id` int(11) NOT NULL auto_increment, `params` text NOT NULL DEFAULT '', `name` VARCHAR(255) NOT NULL , `vlan_id` VARCHAR(255) NOT NULL , PRIMARY KEY (`id`), UNIQUE(name, vlan_id) );
I f only 'name' is checked => no SandBox crash.