Description of problem:

recreate.
1. register system, enable provisioning
2. create a snapshot tag, system -> provisioning -> snapshot tags
3. install a package via webui
4. go back to snapshot tag, click on the tag..

get 500 ise

[Thu Oct 16 12:42:21 2008] [error] Execution of /var/www/html/network/systems/details/history/snapshots/rollback.pxt failed at Thu Oct 16 12:42:21 2008: RHN::Exception: Attempt to set invalid mode 'groups_a_system_is_in' for datasource 'RHN::DataSource::SystemGroup'\n  RHN::DataSource /var/www/lib/RHN/DataSource.pm 68 RHN::Exception::throw\n  RHN::DB::SystemSnapshot /var/www/lib/RHN/DB/SystemSnapshot.pm 110 RHN::DataSource::mode\n  Sniglets::Snapshot /var/www/lib/Sniglets/Snapshot.pm 145 RHN::DB::SystemSnapshot::group_diffs\n  PXT::Parser /var/www/lib/PXT/Parser.pm 171 Sniglets::Snapshot::snapshot_details\n  PXT::Parser /var/www/lib/PXT/Parser.pm 83 PXT::Parser::expand_tag\n  PXT::ApacheHandler /var/www/lib/PXT/ApacheHandler.pm 632 PXT::Parser::expand_tags\n  PXT::ApacheHandler /var/www/lib/PXT/ApacheHandler.pm 123 PXT::ApacheHandler::pxt_parse_data\n  PXT::ApacheHandler /var/www/lib/PXT/ApacheHandler.pm 123 (eval)\n  main -e 0 PXT::ApacheHandler::handler\n  main -e 0 (eval)
[Thu Oct 16 12:42:21 2008] [error] Traceback sent to whayutin at /var/www/lib/PXT/ApacheHandler.pm line 729.
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Grail::Frame';\n$VAR2 = 'Sniglets::Users';
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::HTML';\n$VAR3 = 'Grail::Frame';\n$VAR4 = 'Sniglets::Navi';
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Header';
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Navi';
[Thu Oct 16 12:42:22 2008] [error] config web.product_name not in master config list in PXT::Config at /var/www/lib/PXT/Config.pm line 163.
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::Lists';\n$VAR3 = 'Sniglets::HTML';
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::Header';\n$VAR3 = 'Sniglets::Search';\n$VAR4 = 'Sniglets::Sets';
[Thu Oct 16 12:42:22 2008] [error] Class list:  at /var/www/lib/PXT/ApacheHandler.pm line 527.
[Thu Oct 16 12:42:22 2008] [error] Class list: $VAR1 = 'Sniglets::Utils';\n$VAR2 = 'Sniglets::Users';
[Thu Oct 16 12:42:22 2008] [error] Class list:  at /var/www/lib/PXT/ApacheHandler.pm line 527.
[Thu Oct 16 12:44:14 2008] [error] Class list: $VAR1 = 'Grail::Frame';\n$VAR2 = 'Sniglets::Servers';\n$VAR3 = 'Sniglets::Users';\n$VAR4 = 'Sniglets::Navi';\n$VAR5 = 'Sniglets::HTML';\n$VAR6 = 'Sniglets::Lists';
[Thu Oct 16 12:44:14 2008] [error] Class list:  at /var/www/lib/PXT/ApacheHandler.pm line 527.
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::HTML';\n$VAR3 = 'Grail::Frame';\n$VAR4 = 'Sniglets::Navi';
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Header';
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Navi';
[Thu Oct 16 12:44:17 2008] [error] config web.product_name not in master config list in PXT::Config at /var/www/lib/PXT/Config.pm line 163.
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::Lists';\n$VAR3 = 'Sniglets::HTML';
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Users';\n$VAR2 = 'Sniglets::Header';\n$VAR3 = 'Sniglets::Search';\n$VAR4 = 'Sniglets::Sets';
[Thu Oct 16 12:44:17 2008] [error] Class list:  at /var/www/lib/PXT/ApacheHandler.pm line 527.
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::HTML';\n$VAR2 = 'Sniglets::Servers';\n$VAR3 = 'Sniglets::Users';
[Thu Oct 16 12:44:17 2008] [error] Class list:  at /var/www/lib/PXT/ApacheHandler.pm line 527.
[Thu Oct 16 12:44:17 2008] [error] Class list: $VAR1 = 'Sniglets::Utils';\n$VAR2 = 'Sniglets::Users';