show: undefined method

[dindangdu at yahoo.com (aaaaa bbbbb)]

Thanks for answering to my question, i think i will use framework 3.0, but it seems have some problems maybe i didn't 
installed all packages witch need for framework, also searched on google for this error but no results.

When i do: "use  exploit/exploit_name" 
and then "show payloads" 
i got this error:

[-] Error while running command show: undefined method `>' for nil:NilClass

Call stack:
./lib/msf/core/exploit.rb:547:in `compatible_payloads'
./lib/msf/core/module_manager.rb:219:in `call'
./lib/msf/core/module_manager.rb:219:in `each_module_list'
./lib/msf/core/module_manager.rb:192:in `each'
./lib/msf/core/module_manager.rb:192:in `each_module_list'
./lib/msf/core/module_manager.rb:123:in `each_module'
./lib/msf/core/exploit.rb:541:in `compatible_payloads'
./lib/msf/ui/console/command_dispatcher/core.rb:1251:in `show_payloads'
./lib/msf/ui/console/command_dispatcher/core.rb:784:in `cmd_show'
./lib/msf/ui/console/command_dispatcher/core.rb:768:in `each'
./lib/msf/ui/console/command_dispatcher/core.rb:768:in `cmd_show'
./lib/rex/ui/text/dispatcher_shell.rb:229:in `send'
./lib/rex/ui/text/dispatcher_shell.rb:229:in `run_command'
./lib/rex/ui/text/dispatcher_shell.rb:196:in `run_single'
./lib/rex/ui/text/dispatcher_shell.rb:191:in `each'
./lib/rex/ui/text/dispatcher_shell.rb:191:in `run_single'
./lib/rex/ui/text/shell.rb:118:in `run'
./msfconsole:63

With framework 2.6 everything is fine.