Tellraw not working even with the right syntax and json formatting... Am i doing something wrong?

On 1.9 snapshot i was playing with those command blocks and their options.
I created some kind of contraption (involving command blocks of course) and used this tellraw command:

tellraw @a
{text:"Lock 5 has been",color:blue,extra:[{text:"Disabled!",color:green,bold:true}]}

Every time i use a tellraw command in 1.9, i get this error (or similar, only the column value changes from 2 to 3)

[12:48:45]
Invalid json: malformed JSON at line 1 column 3

What am I doing wrong?? ;'(

EDIT:Fixed, didn't put quotation marks in JSON syntax