Python with Selenium: Unable to locate element error

I am trying to fill a text box but I am getting unable to locate element.

I have tried finding the element

• by class
• by name
• Added 10 secs wait

But I am still getting the same error.

Here is HTML

    <div class="innerWrap">
    <textarea aria-autocomplete="list" aria-controls="typeahead_list_u_0_j"
    aria-expanded="false" aria-haspopup="true" aria-label=
    "Write a birthday wish on his Timeline..." class=
    "enter_submit uiTextareaNoResize uiTextareaAutogrow uiStreamInlineTextarea inlineReplyTextArea mentionsTextarea textInput"
    cols="48" id="u_0_k" name="message_text" placeholder=
    "Write a birthday wish on his Timeline..." role="textbox" title=
    "Write a birthday wish on his Timeline..."></textarea>
</div>

My Code:

textbox =  driver.find_element_by_name('message_text')
textbox.send_keys('Happy Birthday! ')

The web page I am working on is Facebook Birthdays page