use Pie::KnowledgeBase::Rule::Memory said: Couldn't find a JSON package. Need XS, JSON, or DWIW at Net/Twitter/Lite.pm line 11
BEGIN failed--compilation aborted at Net/Twitter/Lite.pm line 11.
Compilation failed in require at Pie/KnowledgeBase/Rule/Memory.pm line 19.
BEGIN failed--compilation aborted at Pie/KnowledgeBase/Rule/Memory.pm line 19.
Compilation failed in require at (eval 29) line 1.
BEGIN failed--compilation aborted at (eval 29) line 1.