Ruby on Rails

After doing a search of @homepages using ajax I want to update my div
with:-
$("testsearch").update("<%= escape_javascript(render(@homepages)%>");
in my index.js.erb

Which does not work as I am getting an internal server error:-
Error during failsafe response: incompatible encoding regexp match
(UTF-8 regexp with ASCII-8BIT string)

Anyone has any ideas why I am getting this error.

As a test the following renders OK.
$("testsearch").update("<%= escape_javascript(render :text =>'this is
UJS')%>");

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