add TODO notes about Errors.
add TODO notes about Errors.

swifthand/reform,francirp/reform,apotonick/reform,joealba/reform,Miralaw/reform,bolshakov/reform,swifthand/reform,prosanelli/reform,joealba/reform,simonc/reform,bolshakov/reform,francirp/reform,halan/reform,eljojo/reform,trailblazer/reform,halan/reform,eljojo/reform,gdott9/reform,prosanelli/reform,Miralaw/reform,mipearson/reform,mipearson/reform