Hi,
 
I was trying to add few debug statement using Report.Error statement in proposal_store.rb, it fails with below error
 
 yast/wfm.rb:222 Client call failed with 'uninitialized constant Installation::ProposalStore::YaST' and backtrace ["/usr/share/YaST2/lib/installation/proposal_store.rb:46:in `initialize'", "/usr/share/YaST2/lib/installation/proposal_runner.rb:84:in `new'", "/usr/share/YaST2/lib/installation/proposal_runner.rb:84:in `run'", "/usr/share/YaST2/lib/installation/proposal_runner.rb:38:in `run'", "/usr/share/YaST2/clients/inst_proposal.rb:24:in `<top (required)>'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:209:in `eval'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:209:in `run_client'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:185:in `call_builtin'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:185:in `call_builtin_wrapper'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:178:in `CallFunction'", "/usr/share/YaST2/modules/ProductControl.rb:1360:in `RunFrom'", "/usr/share/YaST2/modules/ProductControl.rb:1547:in `Run'", "/usr/share/YaST2/modules/OesAddOnProduct.rb:1144:in `DoInstall_WithControlFile'", "/usr/share/YaST2/modules/OesAddOnProduct.rb:1346:in `DoInstall'", "/usr/share/YaST2/clients/oes-install.rb:48:in `main'", "/usr/share/YaST2/clients/oes-install.rb:83:in `<top (required)>'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:209:in `eval'", "/usr/lib64/ruby/vendor_ruby/2.1.0/yast/wfm.rb:209:in `run_client'"]
code is
 
    def initialize(proposal_mode)
      Yast.import "Mode"
      Yast.import "ProductControl"
      Yast.import "Stage"
      Yast.import "Report"
      textdomain "installation"
 
      @proposal_mode = proposal_mode
      YaST::Report.Error("yes")
    end
Any thing missing ?
 
Regards,
Suresh