AutoComplete got error "Uncaught TypeError"

[Sorrawut]

Im trying to use KendoUI Autocomplete on JSON.

My AutoComplete got error " Uncaught TypeError: Cannot call method 'toLowerCase' of undefined"

Here is my code test page.
http://community.moohin.com/test_auto.html 

It's use remote DataSource from follow url 
http://community.moohin.com/run/auto.php 

Data return from this url is fix to 
[{"tag":"item1"},{"tag":"item2"},{"tag":"item3"}] 

I try to solve this for 4 hours.  still fail. T_T

Any Ideas?

[Sorrawut]

now i got this thing work. it's my false.

Thank you

[Relative]

What did you do to fix the problem?